Best Thru Hike Sleeping Bag (2024 Update)
If you’re looking for the perfect sleeping bag for your next thru hike adventure, you need to consider a number of factors before making your purchase. Choosing the right sleeping bag can make or break your experience on the trail, so it’s important to take the time to weigh your options. A thru hike sleeping bag needs to be lightweight, functional, durable, and comfortable, so that you can get a great night’s sleep wherever you may be.
Before you make your purchase, be sure to consider the temperature rating, size and weight, design features, and insulation type. You’ll want to find a sleeping bag that is rated for the lowest temperature you might encounter on your journey, and that can pack down small enough to fit in your pack. Additionally, it’s important to consider any special design features that might be useful on the trail, such as a draft collar or built-in pillow.
Some questions that may be helpful to consider when looking for the best thru hike sleeping bag include: What type of insulation is best for the conditions I’ll be hiking in? What are the pros and cons of down vs synthetic insulation? How much can I afford to spend on a high-quality sleeping bag? By taking the time to consider these factors, you’re sure to find the perfect sleeping bag for your upcoming thru hike adventure.
10 Best Thru Hike Sleeping Bag
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Ideal for backpacking and hiking in cold weather conditions with its 4-season rating and high-quality duck down insulation.
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2
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Ideal for hiking and backpacking in 3 seasons, with ultralight weight and high-quality goose down insulation.
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3
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Ideal for backpacking and camping, providing warmth and comfort with an ultralight and zipperless design.
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4
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Ideal for hiking and camping in cold weather, with 800FP goose down insulation, ultralight design, and hammock compatibility.
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5
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The product is ideal for lightweight and comfortable sleeping in colder temperatures during outdoor activities such as camping and hiking.
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6
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Ideal for lightweight backpacking trips in temperatures around 20 degrees Fahrenheit.
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7
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This product is ideal for camping, backpacking, and hiking in cold weather conditions.
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8
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Ideal for outdoor enthusiasts seeking a warm, lightweight, and easy-to-pack sleeping bag for all seasons of hiking and traveling.
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9
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Ideal for backpacking and hiking in three seasons, with high-quality 650FP duck down insulation for ultralight warmth.
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10
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Ideal for hiking and backpacking in all four seasons, with high-quality duck down insulation and ultralight design.
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1. Snowmass 0f Ultralight Sleeping Bag
The 0 Degree Sleeping Bag for Camping is the ultimate cold weather sleeping bag for all your outdoor adventures. Featuring WR 650 fill power duck down insulation and a revolutionary microscopic ClusterLoft base, this sleeping bag will keep you warm in temperatures ranging from 0 to 30 degrees Fahrenheit.
Designed for thru-hiking, backpacking and camping, this ultralight sleeping bag has a superior weight-to-warmth ratio, weighing in at only 3.38 lbs for the Regular size. A sleeping bag stuff sack is included for easy packing and portability.
The Hydrophobic Water Repellent feature of this sleeping bag ensures that you stay dry during unexpected rain or moisture. The DWR-coated camping sleeping bags for adults feature a 400T 20 D ripstop nylon fabric liner, 2 large YKK zippers with anti-snag sliders, velcro, drawstring & vertical baffles.
Don't sacrifice comfort for weight and space-saving. The regular mummy sleeping bag will comfortably fit a 6ft person, making it perfect for any outdoor enthusiast. This 4 season winter sleeping bag is both warm and ultralight.
Hyke & Byke Sleeping Bags is a USA-based brand that offers a premium quality camping gear collection of adult & kids sleeping bags, camping tents & sleeping pods for all your adventures in the great outdoors. Trust in the quality and durability of this brand for all your camping needs.
2. Hyke & Byke Ultralight Down Sleeping Bag
The 15 Degree Sleeping Bag for Camping is an exceptional piece of gear for individuals who enjoy the great outdoors in cold weather. The sleeping bag has a remarkable WR 800 fill power goose down insulation, which offers remarkable warmth from 15 – 50 F. It is perfect for thru-hiking, backpacking, and camping. This ultralight sleeping bag only weighs 2.54 lbs for Regular and has a superior weight-to-warmth ratio. The sleeping bag stuff sack is included for easy transportation.
The Hydrophobic Water Repellent DWR-Coated camping sleeping bags are designed with a 400T 20 D ripstop nylon fabric liner, 2 large YKK zippers with anti-snag sliders, velcro, drawstring & vertical baffles. The DWR coating offers an additional layer of protection from moisture. This makes the sleeping bag ideal for camping in damp environments, as it will keep you dry and warm throughout the night.
The sleeping bag is designed to save space and weight without sacrificing comfort. The regular mummy sleeping bag is designed to fit a 6ft person comfortably. The sleeping bag is warm but ultralight, making it perfect for 3 season winter camping.
Hyke & Byke Sleeping Bags is a USA-based brand that offers a premium quality camping gear collection of adult & kids sleeping bags, camping tents & sleeping pods for all your adventures in the great outdoors. They are committed to providing the best quality gear to ensure that your camping experience is enjoyable and memorable.
3. Sierra Designs Ultralight Zipperless Sleeping Bag
The Cloud sleeping bag from Sierra Designs is a lightweight mummy bag that offers impressive comfort and features without the added weight. This sleeping bag is designed to be simple and efficient, yet still provides exceptional warmth and a comfortable night's sleep.
Crafted with 800 Fill DriDown insulation and 15D Nylon Ripstop fabrics, the Cloud sleeping bag is built to withstand even the most challenging outdoor conditions. Additionally, its self-sealing foot vent, zipperless design, and cinch cord hood provide superior comfort and ease of use.
The Cloud sleeping bag also features a draft dodger baffle and is EN tested for performance. Its sleeping pad sleeve ensures that you stay in place throughout the night, while the included storage bag and stuff sack make it easy to pack up and go.
With a weight of just 1lb 12oz, the Cloud sleeping bag is perfect for backpacking and travel. It fits individuals up to 5'8" and has a shoulder girth of 59", hip girth of 58", and footbox girth of 39". Its insulation rating of 800 Fill Power DriDown is EN tested to provide a limit of 15°F and a comfort rating of 26°F.
Sierra Designs offers a limited lifetime warranty on all of its products, including the Cloud sleeping bag. When purchased from an authorized retailer, this sleeping bag is warranted to the original purchaser against manufacturing defects in materials and workmanship. If you have any questions or concerns, Sierra Designs' customer service team is available to help.
4. Antero Hammock Sleeping Bag: Ultralight & 4-Season!
The 0 Degree Sleeping Bag for Camping is the perfect solution for those who love camping in the winter. This sleeping bag boasts WR 800 fill power goose down insulation with a revolutionary microscopic ClusterLoft base that can keep you warm even in temperatures ranging from 0 – 30 F.
Designed for thru-hiking, backpacking, and camping, this ultralight sleeping bag has a superior weight-to-warmth ratio, weighing only 3.45 lbs for the Regular size. The sleeping bag comes with a stuff sack for easy portability.
This Hydrophobic Water Repellent sleeping bag features a DWR-coated 400T 20 D ripstop nylon fabric liner, 2 large YKK zippers with anti-snag sliders, velcro, drawstring & vertical baffles. These features help to keep your sleeping bag dry and comfortable, even in wet conditions.
Don't sacrifice comfort! This sleeping bag is the longest mummy sleeping bag, fitting a 6ft 6in person, with wide shoulders and a roomy foot box. The bag is warm but ultralight, making it perfect for all your winter camping needs.
The Hyke & Byke Sleeping Bags brand is based in the USA and offers a premium quality camping gear collection, including adult & kids sleeping bags, camping tents & sleeping pods for all your adventures in the great outdoors. Their focus on quality and innovation make them a trusted choice for all your camping needs.
5. Teton Sports Sleeping-Bags Teton Sports Tracker 5 Lightweight Mummy Sleeping Bag
The TETON Sports Sleeping Bag is the perfect solution for those who want to stay warm and comfortable while backpacking. This sleeping bag is designed with added insulation in the footbox, making it exceptionally warm and lightweight.
The three-piece hood pulls in tightly around your face to keep your whole head warm, while the footbox provides more room for your feet. The full-length zipper draft tube helps to keep the warm air in, ensuring that you stay cozy throughout the night.
One of the best features of this sleeping bag is that you'll never have to roll it again. TETON provides a great compression sack for stuffing your sleeping bag. All you need to do is start at the bottom and stuff the bag in, then tighten the heavy-duty straps.
To sleep even warmer, simply fluff your sleeping bag and use a camp pad. The hang loops are perfect for long-term storage and will help to maintain maximum loft, ensuring that you can use this sleeping bag for many years to come.
At TETON Sports, they stand behind their products. If you have any questions or concerns, you can count on their amazing product support team to get you taken care of and back outdoors with TETON Sports. So, if you're looking for a reliable, warm, and comfortable sleeping bag for your next backpacking adventure, the TETON Sports Sleeping Bag is the perfect choice.
6. Marmot Ironwood 20 Degree Mummy Lightweight Sleeping Bag
Introducing the Ironwood Sleeping Bag by Marmot – your perfect companion for a cozy and comfortable night's sleep under the stars. Designed to provide superior warmth and comfort, this mummy-style sleeping bag is a must-have for any outdoor enthusiast.
Constructed to accommodate even the most restless of sleepers, the Ironwood Sleeping Bag comes with an anatomically shaped footbox that offers extra room to stretch your feet, ensuring maximum warmth and comfort. With its EN tested insulation, this sleeping bag provides warmth in temperatures as low as 20 degrees Fahrenheit. The 650-fill power down with Down Defender improves water resistance, making it suitable for damp nights in the wilderness.
Snags can ruin a good night's sleep, which is why Marmot has incorporated features to prevent them. The snagless insulated draft tube and full-length, locking YKK two-way zipper with anti-snag slider make sure that the bag does not catch on clothing or skin. The zipper garage also keeps the zipper closed and away from skin.
Marmot believes in innovating to improve the human experience, and the Ironwood Sleeping Bag is no exception. The internal stash pocket provides easy access to small gear, while the two hang loops and stuff sack make it convenient to transport and store.
Marmot guarantees the quality of their products and assures that they are free of manufacturer defects. The best part is that you do not need to register your product to avail of their lifetime warranty. With Marmot, you can rest easy knowing that you are covered from the moment you purchase their apparel or equipment.
7. Leef Mummy Sleeping Bag: Lightweight Cold-Weather Companion
The Comfortable Sleeping Bag from TETON Sports is the perfect choice for anyone who loves to camp or backpack. With a wide mummy shape, this sleeping bag provides ample space for a comfortable night's sleep. The soft lining and fiber fill are designed to keep you warm and cozy, even on chilly nights.
If you're looking for a lightweight sleeping bag that won't weigh you down on your next backpacking trip, this Backpacking Sleeping Bag is the perfect choice. With extra fill in the footbox, you'll stay warm even in the coldest temperatures. The mummy shape is designed to minimize weight and maximize warmth.
Whether you're backpacking or camping, the Cozy Backpacking & Camping Gear from TETON Sports is the perfect choice. The sturdy ripstop shell is designed to withstand the rigors of outdoor use, while the cinched hood keeps you warm and comfortable. You'll love the cozy feel of this sleeping bag, no matter where your adventures take you.
The Reliable Camping Essential Accessory is a must-have for any camping or backpacking trip. The anti-snag zippers keep cold drafts out of the sleeping bag, while the stuff sack makes it easy to pack and transport. With two hanging loops, you can easily air-dry or store your sleeping bag when not in use.
TETON Sports is a trusted brand for outdoor and camping gear. They provide the freedom to explore nature and the world with their high-quality products. The Comfortable Sleeping Bag is just one of many excellent products in their lineup, designed to make your camping and backpacking experiences as comfortable and enjoyable as possible.
8. Hihiker 4 Season Mummy Sleeping Bag + Pillow
For the adventurous souls who love spending time outdoors, Hihiker presents an outdoor set that is designed to make your camping, backpacking, and traveling more comfortable. The set includes a mummy style sleeping bag, a carrying storage bag, and a soft travel pillow that you can take with you on your expeditions.
Stay warm and cozy during the night, even in temperatures as low as 20 degrees Fahrenheit, with Hihiker's innovative heat retention technology, quilted construction, and insulated footbox. The adult mummy bag also features a drawstring hood that keeps warm air inside and cold air out, ensuring that your head and neck stay warm throughout the night.
Hihiker understands that your head needs support while sleeping, and that's why they have included a soft travel pillow in the camping mummy bag set. This pillow provides a comfortable sleeping experience on the ground, making you feel as if you're sleeping in your bed. Thanks to its lightweight and packable design, the travel pillow is easy to carry around when you're traveling or hiking.
The Hihiker camping sleeping bag is large enough to fit a 6.2-inch-tall adult, but once you fold it and store it in its durable compression bag, it becomes very compact and easy to carry around. In addition, the hooded mummy sleeping bag and its portable bag are lightweight, so they won't be a burden to carry while you travel, hike or backpack.
Hihiker takes pride in offering a lifetime warranty against defects on their outdoor mummy bag set. This unconditional manufacturer's warranty ensures your complete and utter satisfaction. If for any reason you're unhappy with your new mummy bedroll, the carrying bag, or the travel cushion, let them know, and they will replace them with new ones.
9. Ultralight Duck Down Sleeping Bag – Shavano 32f
Introducing the 32 Degree Sleeping Bag for Camping, the perfect cold weather sleeping companion for your outdoor adventures. Featuring WR 650 fill power duck down insulation, this sleeping bag guarantees warmth from 32 – 60 F with a revolutionary microscopic ClusterLoft base. Designed for thru-hiking, backpacking, and camping, this ultralight sleeping bag boasts a superior weight-to-warmth ratio, weighing only 2.13 lbs for the Regular size. The sleeping bag stuff sack is included for easy transport and storage.
This camping sleeping bag for adults is hydrophobic and water repellent, thanks to its DWR-coated 400T 20 D ripstop nylon fabric liner. It has 2 large YKK zippers with anti-snag sliders, velcro, drawstring, and vertical baffles that prevent cold spots. You don't have to sacrifice comfort for weight and space because the regular mummy sleeping bag can fit a 6ft person. It is warm but ultralight, making it the perfect 3 season winter sleeping bag.
Hyke & Byke Sleeping Bags, a USA-based brand, offers a premium quality camping gear collection of adult and kids sleeping bags, camping tents, and sleeping pods for all your adventures in the great outdoors. With this sleeping bag, you can rest easy and comfortably no matter where your journey takes you.
10. Hyke & Byke 4-Season Ultralight Sleeping Bag
The 0 Degree Sleeping Bag for Camping is the perfect companion for cold weather adventures. It is designed with WR 650 fill power duck down insulation, featuring a revolutionary microscopic ClusterLoft base that provides warmth in temperatures ranging from 0 – 30 F.
This ultralight sleeping bag is ideal for thru-hiking, backpacking, and camping, with a superior weight-to-warmth ratio that weighs only 3.56 lbs for Long. The sleeping bag's stuff sack is included, making it easy to pack and transport.
The Hydrophobic Water Repellent feature of the camping sleeping bag ensures that it stays dry, even in wet conditions. It is made of 400T 20 D ripstop nylon fabric liner, equipped with 2 large YKK zippers with anti-snag sliders, velcro, drawstring, and vertical baffles.
The longest mummy sleeping bag is designed to fit a 6ft 6in person with wide shoulders and a roomy foot box, providing comfort without sacrificing warmth. This 4-season winter sleeping bag is warm, but ultralight, making it the perfect choice for cold weather camping.
Hyke & Byke Sleeping Bags is a USA-based brand that offers premium quality camping gear collection of adult & kids sleeping bags, camping tents & sleeping pods for all your adventures in the great outdoors. Trust them to provide you with the best gear for your next adventure.
Best Thru Hike Sleeping Bag FAQs
How does the material of a thru-hiking sleeping bag affect its performance?
The material of a thru-hiking sleeping bag can significantly affect its performance. Generally, thru-hiking sleeping bags are made of either down or synthetic insulation. The type of insulation used determines the warmth, weight, compressibility, and durability of the sleeping bag.
Down insulation is known for its excellent warmth-to-weight ratio and compressibility. It is also lightweight and highly compressible, making it an excellent choice for thru-hiking sleeping bags. However, down insulation tends to lose its insulating properties when wet, and it can be challenging to dry. Therefore, it is not ideal for humid or wet environments.
Synthetic insulation, on the other hand, is not as compressible as down insulation, but it retains its insulating properties when wet. It is also more durable and economical than down insulation. Synthetic insulation is an excellent choice for thru-hiking sleeping bags for humid or wet environments.
In conclusion, choosing the right material for your thru-hiking sleeping bag is crucial. Down insulation is excellent for dry environments, while synthetic insulation is ideal for wet or humid environments. However, both materials have their advantages and disadvantages, and it is essential to consider your needs and preferences when choosing a thru-hiking sleeping bag.
How important is packability in a thru-hiking sleeping bag?
Packability is a crucial factor to consider when selecting a sleeping bag for thru-hiking. Thru-hikers cover a significant distance on foot and carry all their gear on their backs for an extended period. Therefore, a lightweight and compact sleeping bag is essential to reduce the overall weight of the gear and increase mobility and flexibility.
A highly packable sleeping bag compresses down to a small size, making it easy to fit in a backpack and leaving enough space for other essential items. The size and weight of a sleeping bag can significantly affect the hiker's energy consumption and overall comfort on the trail. A bulky and heavy sleeping bag can cause exhaustion, discomfort, and slow down the hiker's pace.
However, while packability is important, hikers should also consider other essential features such as warmth, durability, and comfort. It's essential to strike a balance between packability and functionality to ensure that the sleeping bag meets the hiker's specific needs and provides maximum comfort and protection during the hike. Ultimately, the ideal sleeping bag for thru-hiking should be lightweight, warm, durable, and highly packable.
How much should I expect to spend on a high-quality thru-hiking sleeping bag?
The cost of a high-quality thru-hiking sleeping bag can vary depending on a few factors such as brand, materials used, and temperature rating. On average, you can expect to spend anywhere from $250 to $500 for a reliable and durable sleeping bag that is suitable for thru-hiking. Some well-known brands such as Western Mountaineering, Feathered Friends, and NEMO Equipment offer sleeping bags at the higher end of this price range but are known for their quality and performance. It's important to consider the temperature rating of the sleeping bag and ensure it is suitable for the climate and conditions of your thru-hike. Additionally, investing in a high-quality sleeping bag can save you money in the long run as it will last longer and perform better than a cheaper, lower quality option. Ultimately, it's crucial to prioritize your comfort and safety on a thru-hike, and a high-quality sleeping bag is a worthwhile investment.
What are the most important features to look for in a thru-hiking sleeping bag?
When it comes to selecting a sleeping bag for thru-hiking, there are a few key features that should be considered. Firstly, the weight of the sleeping bag is crucial, as thru-hikers are often looking to minimize the weight of their gear. Look for a sleeping bag that is lightweight and compressible, so it can easily fit into a backpack. Secondly, the temperature rating of the sleeping bag is important, as it needs to be suitable for the conditions you will be hiking in. Consider the lowest temperature you are likely to encounter on your hike and choose a sleeping bag with a temperature rating that is a few degrees lower than that. Thirdly, the type of insulation used in the sleeping bag is important. Down insulation is lightweight and compressible, but can be problematic in wet conditions. Synthetic insulation is bulkier but performs better in wet conditions. Finally, the shape of the sleeping bag is important. A mummy-shaped sleeping bag is more thermally efficient and will keep you warmer than a rectangular-shaped bag. Consider these factors when selecting a sleeping bag for thru-hiking to ensure that it meets your needs on the trail.
What are the top-rated sleeping bags for thru-hiking?
When it comes to thru-hiking, having a good quality sleeping bag is essential. There are several top-rated sleeping bags that are perfect for thru-hiking. The first one on the list is the Western Mountaineering Ultralite sleeping bag. This sleeping bag is lightweight, packable, and has a temperature rating of 20 degrees Fahrenheit. It also has a premium quality down insulation that will keep you warm in even the coldest temperatures.
Another great option is the Feathered Friends Swallow Nano sleeping bag. This bag is also lightweight and packable, and has a temperature rating of 20 degrees Fahrenheit. It is made with high-quality down insulation that will keep you warm and comfortable all night long.
The NEMO Forte sleeping bag is another popular choice for thru-hikers. It has a temperature rating of 20 degrees Fahrenheit and is made with a unique "spoon" shape that allows for more movement and comfort while sleeping. It also has a waterproof footbox that will keep your feet warm and dry.
Lastly, the Therm-a-Rest Questar sleeping bag is a reliable option for those looking for a temperature rating of 20 degrees Fahrenheit. It has a comfortable fit and is made with high-quality down insulation that will keep you warm and cozy on even the coldest nights. Overall, these are some of the top-rated sleeping bags for thru-hiking that you can consider for your next adventure.
What is the best size and shape for a thru-hiking sleeping bag?
When it comes to thru-hiking sleeping bags, there are a few factors to consider in determining the best size and shape. First is your personal preference and comfort level. Some hikers prefer a more snug fit for warmth, while others prefer a roomier bag for added comfort.
In general, a mummy-shaped sleeping bag is the most popular option for thru-hiking due to its lightweight and compressible nature. It is designed to fit snugly around the body, minimizing dead space and retaining warmth efficiently.
In terms of size, it is recommended to choose a sleeping bag that fits your height and weight. A bag that is too small will restrict movement and cause discomfort, while a bag that is too large will not retain heat as effectively. Most manufacturers provide size charts to ensure a proper fit.
Ultimately, the best size and shape for a thru-hiking sleeping bag will depend on your individual needs and preferences. It is important to consider factors such as weight, warmth, and comfort when making your selection.
What is the best weight-to-warmth ratio for a thru-hiking sleeping bag?
Choosing the right sleeping bag for a thru-hiking adventure can be a challenging task. One of the most important factors to consider is the weight-to-warmth ratio. The ideal weight-to-warmth ratio for a thru-hiking sleeping bag depends on several factors, including your personal preferences, the expected weather conditions, and the length of your hike.
A good rule of thumb is to look for a sleeping bag with a weight-to-warmth ratio of around 1:2. This means that the bag should weigh one pound for every two degrees of warmth it provides. However, this ratio can vary depending on the conditions you'll be facing on your hike. For example, if you'll be hiking in colder weather, you may want a sleeping bag with a higher weight-to-warmth ratio.
Ultimately, the best weight-to-warmth ratio for your thru-hiking sleeping bag will depend on your individual needs and preferences. It's important to do your research and choose a sleeping bag that will keep you warm and comfortable throughout your hike, without weighing you down or taking up too much space in your pack.
What is the ideal length for a thru-hiking sleeping bag?
The ideal length for a thru-hiking sleeping bag depends on your height and personal preferences. Generally, sleeping bags come in different sizes, and manufacturers recommend choosing a bag that is at least 6 inches longer than your height to ensure that you have enough room to move around comfortably. However, if you are taller than average, you might need a longer bag to accommodate your height.
Moreover, it's important to consider the weight and packability of the sleeping bag, especially for thru-hiking where every ounce counts. A lightweight, compressible sleeping bag that can be easily packed into a small space is ideal.
In summary, the ideal length for a thru-hiking sleeping bag is at least 6 inches longer than your height, but taller individuals may require a longer bag. It's important to also consider the weight and packability of the sleeping bag to ensure that it's suitable for long-distance hiking.
What temperature rating should a thru-hiking sleeping bag have?
When it comes to thru-hiking, selecting the right sleeping bag is crucial for a comfortable and restorative night's sleep. The temperature rating of your sleeping bag is one of the most important factors to consider. A thru-hiking sleeping bag should have a temperature rating of around 20-30 degrees Fahrenheit, depending on the time of year and location of your hike. This temperature rating will keep you warm and comfortable in most conditions, without adding too much weight to your pack. It's important to note that temperature ratings are not always accurate for everyone, as factors such as metabolism, clothing, and sleeping pad insulation can affect how warm or cold you feel. It's always a good idea to test your sleeping bag in different conditions before embarking on a thru-hike to ensure you have the right gear for your needs.
What type of insulation is best for a thru-hiking sleeping bag?
When it comes to insulation for a thru-hiking sleeping bag, there are several options available. The best insulation type for a thru-hiking sleeping bag depends on various factors such as personal preference, weather conditions, and weight.
Down insulation is a popular choice for thru-hikers because it is lightweight, compressible, and has excellent warmth-to-weight ratio. It is also highly compressible, which is essential for backpackers who need to minimize weight and pack size. However, down insulation can be a challenge when exposed to moisture, as it loses its insulating properties when wet.
Synthetic insulation is another option for thru-hiking sleeping bags. Synthetic insulation is bulkier and heavier than down insulation, but it retains its warmth even when wet. This makes it a good option for hikers who plan to hike in wet or humid conditions.
Ultimately, the best insulation type for a thru-hiking sleeping bag depends on personal preference and the expected weather conditions. It is essential to consider the weight, compressibility, and warmth of the insulation material before making a decision.