Good sleep equals a better, safer day outside. The body works overtime in cold, winter conditions, and staying warm while sleeping is essential to conserving crucial energy adventurers need during the day. Therm-a-Rest has been keeping campers warm and comfortable at night since 1971, from the summit of Mt. Rainier to the icy reaches of the North and South Pole.
With over 45 years of experience, Therm-a-Rest has built some of the warmest and lightest winter sleep systems on the market, from the NeoAir XTherm and RidgeRest Solar mattresses, to the Altair HD and Adara HD down sleeping bags.
No sleep system is complete without a mattress. Take it from polar-explorer Eric Larsen, who leads expeditions to some of the coldest environments on earth: maintaining a safe and comfortable temperature at night is key to survival. For winter campers in need of a warm and indestructible mattress, the RidgeRest Solar is Larsen’s tested and trusted sleep system of choice. The mattress is made with a lightweight, closed-cell foam for unmatched durability on any surface and Therm-a-Rest’s proprietary ThermaCapture radiant heat technology amplifies warmth by 20%. Lighter weight closed-celled options include the Z Lite Sol for ounce counters, as well as the Z Seat for quick rests during epic days of backcountry skiing.
“Therm-a-Rest products have always been an integral part of my adventures,” says Larsen. “I’ve taken my RidgeRest to both poles and up Everest – it’s sturdy as hell and lasts forever.”
When lightweight is of the utmost importance, experienced long-distance and extreme winter travelers choose the NeoAir XTherm. With an R-Value of 5.7, a weight of only 430 grams (15 oz.), and a loft of 6 centimeters (2.5 in.) once fully inflated, this is one of the lightest and warmest mattresses available on the market. ThermaCapture traps the heat while Therm-a-Rest’s Triangular Core Matrix design minimizes convective heat loss, allowing for a fully capable 4-season mattress that packs down to the size of a one-liter water bottle. The NeoAir XTherm MAX, launched in 2015 offers all the benefits of the original XTherm in a full rectangular shape, providing more surface area for the broader or restless sleeper.
Therm-a-Rest’s down 4-season sleeping bags offer comfort and warmth while resting during the coldest months of the year to conserve the energy you’ll need during the day. The Altair HD and women’s-specific Adara HD are designed with zoned insulation and 750+ fill Nixwax Hydrophobic Down is placed where it’s needed most to avoid teeth-chattering nights. ThermaCapture technology ensures further warmth by reflecting the sleeper’s body warmth right back at them with no added weight. Further bag details include cinchable hoods and a heat-trapping draft collar and full-length zipper draft tube to ensure cold air stays out and warmth is trapped inside where it’s needed.
The XTherm air mattress delivers the greatest warmth-to-weight ratio available in any air mattress by far, with a new, softer, textured no-slip fabric for better next-to-skin comfort and a quieter rest. Multiple reflective ThermaCapture layers give the XTherm air mattress true four-season warmth without the weight or bulk usually found in a winter-worthy mattress. And now, the XTherm MAX delivers all the great features and benefits of the original XTherm in a full rectangular shape, providing added coverage and warmth for extreme temps and wider torsos. RRP £160-185.00
This lightweight closed-cell foam mattress is coated with a layer of our reflective ThermaCapture coating that redirects radiant heat back at your body to amplify warmth. Working in conjunction with the classic RidgeRest peaks and valleys, the RidgeRest Solar mattress delivers exceptional insulation in an ultralight and virtually indestructible package for backcountry travelers. For maximum warmth, use reflective side-up. RRP £40.00-50.00
Z Lite Sol
Still a favorite of the ultralight elite, the Z Lite mattresses are our lightest, most compact closed-cell mattresses. Both the Z Lite SOL and the original Z Lite feature a compact accordion-style shape and heat-trapping dimples. The Z Lite SOL adds our reflective ThermaCapture™ coating that helps capture radiant heat, increasing overall warmth by nearly 20%. The proprietary foams are softer on top for extra comfort and denser on the bottom for extra durability. Wherever you’re headed, a Z Lite mattress is the right choice for ultralight warmth, durability and comfort. RRP £40.00
With its accordion-style design and closed-cell foam construction, the Z Seat camping seat is an ounce-counter’s solution to on-the-spot comfort. It’s virtually indestructible and superlight, making it ideal for backpacking, ski touring and relaxing on rough terrain. Available with or without our warmth boosting, reflective ThermaCapture™ surface treatment. There’s hardly a place that the added comfort isn’t worth it. RRP £13.00
From an overnight snowshoe to a multi-day ski tour, the Altair winter sleeping bag features Nixwax Hydrophobic Down and a reflective ThermaCapture lining to reliably keep you warm in the coldest months of the year. And when the temps are this low, you’ll really appreciate how the SynergyLink System keeps your mattress connected to the bag to maintain the precious warmth you need to sleep well. It also provides you the freedom to move however you like throughout the night, allowing you to wake fresh for the day ahead. RRP £500.00
Now featuring Nikwax Hydrophobic Down, the Adara women’s winter down sleeping bag provides reliable warmth for multi-night ski tours, winter climbs and snowshoe trips. A women’s-specific cut minimizes excess space and key features like our Toe-asis Foot Warmer, reflective ThermaCapture lining and mattress integration assure you’ll stay warmer and sleep better, leaving you with more energy for better days in the backcountry. RRP £490.00