What Our Gearhead(R) Experts Are Saying:"I've taken the Dura 10R on sub-zero alpine nights and it's easily one of the warmest pads I've used. The R-value of 10 is no joke-paired with a proper bag, I slept warm at -20degF. It's thick, super insulated, and packs reasonably small for how much protection it offers."When we're venturing deep into the cold, the Dura 10R Sleeping Pad delivers warmth and security we can trust. Optimized for extreme environments-from alpine expeditions to winter camping-this pad features upgraded DownMat Technology(TM) and a recycled synthetic insulation that keeps the cold out and comfort locked in, even when temps drop to -40degF. With an R-value of 10 and a 3. 5-inch thickness, the Dura 10R combines plush comfort with maximum thermal efficiency. The bluesign(R)-approved fabric is built tough for repeated use in rugged terrain, and the recycled microfiber insulation retains warmth without packing down over time. It's an ideal companion for mountaineers, winter backpackers, or anyone pushing into the harshest terrain.