Therm-a-Rest Sleeping Bag Review 2023


Are you a keen camper or backpacker searching for the perfect sleeping bag to accompany you on your outdoor adventures? Look no further than Therm-a-Rest, a brand providing high-quality gear for over 45 years.

This Therm-a-Rest sleeping bag review will give you the information and knowledge to decide on your next purchase.

With their innovative technologies and commitment to customer satisfaction, Therm-a-Rest sleeping bags are a top choice for outdoor enthusiasts.

Therm-a-Rest Sleeping Bag Review

Brand History

Now, let me take you on a thrilling journey through the fascinating backstory of Therm-a-Rest. The brand was founded in 1972 by two outdoor enthusiasts tired of sleeping on uncomfortable, bulky air mattresses during their camping trips. They wanted to create a lightweight and comfortable solution for backpackers and hikers, so they invented the world’s first self-inflating sleeping pad.

Therm-a-Rest’s innovative product quickly became popular among outdoor enthusiasts, and the brand continued expanding its product line over the years. In 1995, they introduced their first sleeping bag – the Prolite – designed to be lightweight yet warm enough for cold weather conditions. Since then, Therm-a-Rest has become known for producing high-quality sleeping bags perfect for all camping adventures.

Today, Therm-a-Rest continues to push boundaries with its innovative technologies and commitment to creating products that enhance your outdoor experience. So whether you’re looking for a sleeping bag that can keep you warm in sub-zero temperatures or lightweight enough to carry on long backpacking trips, Therm-a-Rest has got you covered. So now that you know a little about this brand’s history, let’s dive into some of its most innovative technologies.

Innovative Technologies

You’ll be impressed by the cutting-edge features of this top-of-the-range piece of equipment, setting it apart from any other sleeping bag on the market. Therm-a-Rest has always been at the forefront of innovative technologies, and their sleeping bags are no exception. Here are some of the most impressive features that you can expect:

  • ThermaCapture technology: This feature uses a reflective barrier to trap radiant heat, keeping you warm and cosy throughout the night. It’s beneficial for cold-weather camping trips.
  • SynergyLink Connectors: These connectors allow your sleeping bag to attach directly to your sleeping mat, preventing any sliding or shifting during the night. The result is a more comfortable and stable sleep experience.
  • Zoned Insulation: This feature strategically places insulation where you need it most (like your core) while minimising bulk in areas you don’t (like your feet). The result is a lighter-weight sleeping bag with superior warmth.

With all these advanced features, it’s no wonder that Therm-a-Rest sleeping bags have become so popular among outdoor enthusiasts. So whether you’re planning a mountaineering expedition or simply spending a weekend camping with friends, the Therm-a-Rest sleeping bag will meet your needs.

As you explore Therm-a-Rest’s wide variety of sleeping bags, remember which features are most important to you. With options ranging from ultralight backpacking bags to luxurious car-camping models, there’s something for everyone. So why settle for an ordinary sleeping bag when you could experience the comfort and innovation of a Therm-a-Rest?


Therm-a-Rest is partnered with the European Outdoor Conservation Association.

Sleeping Bag Collection

Prepare yourself for the ultimate outdoor comfort and innovation with a wide range of top-of-the-line gear from Therm-a-Rest. They offer a variety of sleeping bags designed for different weather conditions, activities, and personal preferences. You can choose from lightweight bags for backpacking, spacious rectangular bags for car camping, or hybrid models that combine the best features of both options.

Therm-a-Rest’s sleeping bag assortment includes choices for every season. For summer adventures, you can choose a lightweight bag with a temperature rating of 30°F or higher. In spring and fall, you may need a bag that can handle temperatures as low as 10°F or even 0°F. And if you’re planning a winter trip, Therm-a-Rest has you covered with down or synthetic insulated bags rated to -40°F.

Aside from selecting the correct temperature rating and shape (mummy vs rectangular), you can also personalise your sleeping bag by choosing features like hood cinches, draft collars, zippers on both sides or just one side, foot vents, stash pockets, and more. With so many options available, you will find a Therm-a-Rest sleeping bag that meets all your needs and exceeds your expectations.

When considering your options for Therm-a-Rest sleeping bags, remember that each product is backed by decades of research and development and rigorous testing in real-world environments. The company is proud to use high-quality materials such as Nikwax Hydrophobic Down™ insulation or ThermaCapture™ technology to ensure maximum warmth without bulkiness. Whether going on a solo adventure or sharing your tent with friends or family, you can trust that your Therm-a-Rest sleeping bag will always provide exceptional quality and performance.

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Product Quality and Performance

The Therm-a-Rest sleeping bags are of top-notch quality and performance, made with high-quality materials and innovative technology to provide maximum warmth and comfort in any outdoor environment. They are designed to offer the best possible experience for those who want to enjoy the great outdoors without compromising comfort or safety. Here are five reasons why the Therm-a-Rest sleeping bags are unbeatable in terms of product quality and performance:

  1. The high-quality insulation materials effectively trap heat while remaining lightweight.
  2. The durable outer shell resists tears, abrasions, and other forms of damage.
  3. The innovative design features, such as draft collars, foot boxes, and zoned insulation, ensure maximum warmth.
  4. The comfortable fit allows you to move around freely without feeling constricted.
  5. Advanced technologies like Hydrophobic Down provide superior performance in extreme weather conditions.

Whether camping in the mountains or backpacking through remote wilderness areas, the Therm-a-Rest sleeping bag will keep you warm, comfortable, and safe throughout your journey. With so many innovative features and high-quality materials incorporated into each product, it’s no surprise that outdoor enthusiasts highly regard these sleeping bags.

Remember that customer satisfaction is also essential when purchasing a Therm-a-Rest sleeping bag for your next adventure. The company offers an excellent warranty program that protects your investment against defects in workmanship or material. By choosing the Therm-a-Rest sleeping bag for your next camping trip or backpacking adventure, you can be confident that you’re getting a high-quality product with exceptional customer service.

Customer Satisfaction and Guarantee

If you’re seeking reassurance that your investment is protected, remember that Therm-a-Rest provides a unique warranty programme to ensure your satisfaction and peace of mind. In addition, the company’s customer service team is renowned for their prompt and helpful responses, making filing a claim or asking questions about the warranty simple and stress-free.

Therm-a-Rest’s warranty programme covers any defects in materials or workmanship for the product’s lifetime, giving you confidence in your purchase. Additionally, if a product fails due to normal wear and tear within three years of purchase, Therm-a-Rest will repair or replace it free of charge. With such comprehensive coverage and outstanding customer support, it’s no wonder why so many customers have reported feeling extremely satisfied with their experience with Therm-a-Rest.

Investing in a high-quality sleeping bag like the Therm-a-Rest Questar is an excellent choice for anyone who loves spending time outdoors. With its innovative design features and premium materials, this sleeping bag keeps you warm and comfortable even on the coldest nights. In the following section, we’ll explore some of these features in more detail to help you better understand what makes Questar such a great product.

Therm-a-Rest Questar

Are you looking for a cosy and comfortable sleeping experience outdoors? Look no further than the Therm-a-Rest Questar. This high-quality sleeping bag boasts 650 Fill Nikwax Hydrophobic Down™ insulation, which provides excellent warmth without adding unnecessary weight. Additionally, the W.A.R.M. Fit ensures natural sleep positions and thermal efficiency, while the SynergyLink™ Connectors allow pad integration to keep you securely in place throughout the night.

The Questar also features zoned insulation for optimal warmth, weight savings, and box baffled construction to prevent cold spots and maximise the loft. The Toe-asis™ Foot Warmer Pocket is perfect for those with perpetually chilly feet, while quilt and blanket loops allow for customisation of your sleep system. And with Responsible Down Standard Certification, you can rest easy knowing that this product was ethically produced. Finally, additional features like a draft collar, zipper draft tube, snag-free zipper, cinchable hood, and external zip pocket make this sleeping bag even more attractive.

Product Specifications:

  • Temperature Rating: 32F/0C
  • Sizes Available: Regular (also available in Small and Long)
  • Insulation Type: 650 Fill Nikwax Hydrophobic Down™
  • Weight: 2 lbs 1 oz / 935 g (regular size)
  • Dimensions (Regular): Fits users up to 6 ft /183 cm; Shoulder girth: 62 in /157 cm; Hip girth: 58 in /147 cm; Footbox width:38 in/97cm


  • Excellent insulation keeps you warm even on very cold nights.
  • Innovative design features like zoned insulation and Toe-asis™ Foot Warmer Pocket provide added comfort.
  • A variety of customisable options add versatility to your camping gear.


  • It may be too warm for use during summer or other mild weather conditions.
  • Higher price point than some other sleeping bags on the market.
  • It may be more lightweight and compact than some ultralight options.

Therm-a-Rest Parsec

You will appreciate the innovative features of the Therm-a-Rest Parsec, such as its 800-fill Nikwax Hydrophobic Down™ that absorbs 90% less water and dries 3x faster than untreated down. This means you can stay warm and dry even in wet conditions, making it ideal for unpredictable weather. The anti-snag YKK® zipper ensures easy opening and closing without snags or catches. The GRS-certified recycled nylon shell is not only eco-friendly but also durable, ensuring your sleeping bag lasts for years to come.

The full-length zipper draft tubes prevent cold air from entering the zippered area so you can stay warm throughout the night. The pinchable hood helps trap heat inside and keeps your head warm even in chilly temperatures. You can connect the Parsec to your sleeping pad using ultralight straps, preventing slipping and sliding while you sleep. And with an external zip pocket, you have a convenient place to store essentials like your phone or keys while keeping them close at hand.

Product Specifications:

  • Available sizes: Small, Regular, Long
  • Weight: 1 lb 13 oz (822 g)
  • Temperature Rating: EN Comfort Limit -0.9°C / EN Lower Limit -7.2°C / EN Extreme Limit -24°C
  • Fill Material: 800-fill Nikwax Hydrophobic Down™
  • Shell Material: GRS-certified recycled nylon


  • Lightweight and highly compressible
  • Absorbs less water and dries faster than untreated down
  • Eco-friendly materials used in construction
  • Foot Warmer Pocket adds extra warmth to feet
  • External zip pocket provides storage space


  • Pricey compared to other sleeping bags on the market
  • Only available in one colour option
  • Some users may find it too narrow for their liking

Therm-a-Rest Saros

The Therm-a-Rest Saros sleeping bag from Therm-A-Rest is equipped with features that ensure warmth and comfort, regardless of your sleeping position. The W.A.R.M. Fit design allows for various sleeping positions, while the SynergyLink™ Connectors seamlessly integrate with your sleeping pad for added comfort. Zoned insulation maximises warmth while minimising weight, making it easy to pack and go. The Toe-asis™ Foot Warmer Pocket keeps your feet warm on chilly nights, and Quilt and Blanket Loops provide additional insulation when necessary.

The draft collar and cinchable hood work together to retain heat and keep cold air out, ensuring a restful night’s sleep without the fear of waking up shivering. With an external zip pocket, snag-free zipper, and compression sack included, the Saros has everything you need for a successful camping or backpacking trip.

Product Specifications:

  • Insulation: eraLoft™ synthetic fill
  • Size options: Small/Regular/Long
  • Season rating: Three-season
  • Design features: W.A.R.M. Fit design, SynergyLink™ Connectors, Zoned Insulation, Toe-asis™ Foot Warmer Pocket, Quilt and Blanket Loops, draft collar, cinchable hood
  • Additional features: External zip pocket, snag-free zipper


  • Accommodates multiple sleeping positions
  • Integrated with a sleeping pad for added comfort
  • Maximises warmth while minimising weight
  • Keeps feet warm
  • Additional insulation is available if needed.
  • The draft collar and cinchable hood retain heat.


  • Rated for three-season use only
  • Limited size options compared to other brands
  • Synthetic insulation may not be as durable as down over time

Therm-a-Rest Hyperion

If you’re searching for a top-performing, super-light sleeping bag that maximises warmth while minimising weight, consider the Therm-a-Rest Hyperion Weighing just 1 lb 4 oz., this bag is one of the lightest in its category, making it an excellent choice for backpackers and hikers who want to travel fast and light. In addition, the Hyperion uses 900-fill Nikwax Hydrophobic Down™, which stays drier and maintains loft 60 times longer than untreated down, ensuring you stay warm even in damp conditions.

The box-baffled construction of the Hyperion uses mesh walls to maximise loft and minimise cold spots in crucial areas, providing unparalleled warmth and comfort. This sleeping bag’s ergonomic shape and more extended zipper also ensure a more human-friendly fit than other super-light bags. Additionally, the SynergyLink™ Connectors integrate the bag with a mattress for optimal efficiency and comfort; they can also be removed for versatility. With all these features combined, it’s no wonder why the Therm-a-Rest Hyperion won the 2019 BACKPACKER Editors Choice Award.

Product Specifications:

  • Size: Regular
  • Colour: Deep Pacific
  • Weight: 1 lb 4 oz / 0.58 kg
  • Packed Dimensions: 6 x 8 in / 15 x 20 cm
  • Ready Dimensions: 28.5 x 80 x 4.5 in
  • Fill Material: 900 Fill Goose Nikwax Hydrophobic Down R.D.S.
  • Fill Weight:12.5 oz /0.36 kg
  • Shell Fabric:10D Nylon RipStop w/ DWR
  • Lining Fabric :10D Nylon RipStop
  • Zipper Side : Left


  • Extremely lightweight
  • High-quality insulation keeps you warm even when wet
  • The ergonomic shape and more extended zipper provide a more comfortable fit
  • Box-baffled construction minimises cold spots for maximum warmth and comfort.
  • SynergyLink™ Connectors integrate the bag with a mattress for optimal efficiency and comfort.


  • Expensive compared to other sleeping bags on the market
  • Some users may find it too narrow or constricting

Comparison Chart

Now that you understand what the Therm-a-Rest Hyperion sleeping bag offers let’s look at how it compares to other models. In this subtopic, we’ll provide you with a detailed comparison table so you can easily see the differences and similarities between various Therm-a-Rest sleeping bags.

The table will include important information such as weight, temperature rating, fill power, and dimensions. This will allow you to compare the features of different models and decide which is right for you. For example, while some models may be heavier or lighter than others, they may also offer more insulation or comfort.

By comparing different models in a clear and concise way, we hope to give you all the information you need to choose the best sleeping bag for your next adventure. So without further ado, let’s dive into our comparison table and see how each model stacks up against one another.

As we wrap up this section on comparison tables, it’s important to remember that choosing the right sleeping bag ultimately comes down to your needs and preferences. While our table provides valuable information on each model’s features and specs, it’s up to you to decide what matters most when you’re out in nature. In the next section, we’ll discuss some key factors to consider when choosing a Therm-a-Rest sleeping bag so that you can make an informed decision based on your unique situation.

Fill Material650 Fill Duck Nikwax Hydrophobic Down RDS900 Fill Goose Nikwax Hydrophobic Down RDSeraLoft™ Polyester Hollow Fibre800 Fill Goose Nikwax Hydrophobic Down RDS
Fill Weight14 oz / 0.40 kg8.5 oz / 0.25 kg2 lbs 5 oz / 1.06 kg1 lbs 8 oz / 0.68 kg
Shell Fabric20D Polyester w/ DWR10D Nylon RipStop w/ DWR20D Polyester w/ DWR100% Recycled Nylon RipStop w/ DWR
Lining Fabric20D Polyester Taffeta10D Nylon RipStop20D Polyester Taffeta100% Recycled Nylon RipStop
Sizes AvailableSmall, Regular, LongSmall, Regular, LongSmall, Regular, LongSmall, Regular, Long
ColorBalsamBlack ForestStargazerLarch
Weight1 lbs 14 oz / 0.85 kg1 lb / 0.46 kg3 lbs 3 oz / 1.46 kg2 lbs 2 oz / 0.98 kg
Dimensions (L x W x H)31.5 x 80 x 4 in28.5 x 80 x 4 in31.5 x 80 x 4.5 in29 x 73 x 5.5 in
Fits Height72 in (6 ft) / 183 cm72 in (6 ft) / 183 cm72 in (6 ft) / 183 cm66 in / 168 cm
Girth, Shoulder63 in / 160 cm57 in / 145 cm63 in / 160 cm58 in / 147 cm
Girth, Hip61 in / 155 cm49.5 in / 126 cm61 in / 155 cm57 in / 145 cm
Girth, Foot box46 in / 117 cm43 in / 109 cm46 in / 117 cm44 in / 112 cm
Packed Dimensions6.5 x 8.5 in / 17 x 22 cm5.5 x 6 in / 14 x 15 cm9.5 x 10.5 in / 24 x 27 cm8 x 9 in / 20 x 23 cm
Comfort Range5 C / 41 F5 C / 41 F0 C / 32 F-10 C / 14 F
Transition Range0 C / 32 F0 C / 32 F-6 C / 20 F-18 C / 0 F
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Comparison Table

Frequently Asked Questions

  1. Are Therm-a-Rest sleeping bags appropriate for use in extremely cold weather conditions?

    If you plan to camp in extremely cold weather, you must ensure your sleeping bag can handle it.

    Therm-a-Rest sleeping bags are renowned for their high-quality construction and ability to keep you warm even when the temperatures drop below freezing.

    These sleeping bags are designed with draft collars, insulated hoods, and premium down or synthetic insulation options to provide maximum warmth and comfort in harsh environments.

    So whether you’re embarking on a winter backpacking trip or need a dependable sleeping bag for your next camping expedition, Therm-a-Rest has you covered.

  2. Do Therm-a-Rest sleeping bags come with a stuff sack?

    The answer is yes if you’re wondering whether Therm-a-Rest sleeping bags come with a compression sack.

    The brand’s sleeping bags are designed for outdoor enthusiasts who want to travel light and fast. That’s why they come with a compact and lightweight compression sack that reduces their volume by up to 50%.

    Therm-a-Rest sleeping bags feature high-quality materials that provide excellent insulation, warmth, and comfort for all your adventures. Whether you’re camping in the mountains or exploring the wilderness in winter conditions, these sleeping bags will keep you warm and cosy throughout the night without weighing you down.

    If you value freedom of movement and minimalism in your outdoor gear, the Therm-a-Rest sleeping bag is needed to elevate your camping experience.

  3. What is the average lifespan of a Therm-a-Rest sleeping bag?

    When considering the lifespan of the Therm-a-Rest sleeping bag, there are multiple factors to consider. The materials’ quality, how well they are maintained, and frequency of use determine their longevity.

    On average, a well-maintained Therm-a-Rest sleeping bag can last 5-10 years. However, individuals who frequently camp or backpack may experience more wear and tear, resulting in a shorter lifespan for their sleeping bag.

    To ensure maximum durability and longevity for your Therm-a-Rest sleeping bag, it is essential to follow proper care instructions and invest in a high-quality storage sack when not in use.

  4. Can Therm-a-Rest sleeping bags be used for hiking and camping while carrying a backpack?

    If you’re searching for a portable sleeping bag for backpacking excursions, therm-a-Rest sleeping bags are worth considering.

    These bags are designed with portability in mind, so they can easily fit into your backpack without weighing you down too much.

    Furthermore, many models feature lightweight materials and compressible insulation that help keep them compact when not in use.

    So whether you’re planning a multi-day trek through the wilderness or need a dependable option for camping trips, therm-a-Rest sleeping bags are an excellent choice for anyone seeking comfort and convenience on the go.

  5. Are Therm-a-Rest sleeping bags suitable for washing in a washing machine?

    When looking after your Therm-a-Rest sleeping bag, you may wonder if putting it in the washing machine is safe. The good news is that many Therm-a-Rest sleeping bags can be machine washed!

    However, remember a few essential things before putting your bag in the washer. First and foremost, make sure to follow the care instructions provided by Therm-a-Rest. These will vary depending on the specific model of sleeping bag you have.

    In general, it’s best to use a front-loading washing machine with cold water and mild detergent. Avoid using fabric softeners or bleach, as these can damage the insulation in your sleeping bag.

    Once washed, tumble dry on low heat or lay flat to air dry. With proper care and maintenance, your Therm-a-Rest sleeping bag will provide years of comfortable nights under the stars!

    Remember: ‘Take care of your gear, and it will take care of you.’

For more information about How to Stay Warm in a Sleeping Bag


So, you’ve reached the end of our Therm-a-Rest sleeping bag review and well done! We hope we have given you an overview of this well-respected brand and its innovative technologies.

Before we finish, let us share an interesting fact with you. Did you know that 93% of customers who bought a Therm-a-Rest sleeping bag said they were satisfied? This says a lot about the quality and performance of these bags and the company’s exceptional customer service and warranty.

In conclusion, if you’re looking for a top-quality, durable, long-lasting sleeping bag, you can’t go wrong with Therm-a-Rest. With their wide range of products, including the Saros and Hyperion models we reviewed in detail, there is sure to be something that suits your needs and preferences.

So why wait? Invest in a Therm-a-Rest sleeping bag today and enjoy unbeatable comfort on your next outdoor adventure!