What Our Gearhead(R) Experts Are Saying:"I've used the Ultra 6. 5R on snow-covered ground and never once felt the cold seep through. It's warm enough for true winter camping and still packs down small. If you're going ultralight but need serious insulation, this pad is dialed."When snow lines the trail and cold air creeps into camp, we trust the EXPED Ultra 6. 5R Sleeping Pad to keep our nights warm. Built for fast-moving missions in sub-zero conditions, this pad balances rugged insulation with a compact, carry-friendly design-ideal for alpine adventures, winter backpacking, and four-season pushing. With a 6. 4 ASTM R-value and SynMat Plus Technology(TM), the Ultra 6. 5R combines recycled microfiber and reflective foil to trap heat and block ground chill-tested down to -4degF. Its 3. 5-inch thickness gives us reliable cushion on frozen terrain, while the bluesign(R) approved 20D recycled ripstop polyester shell adds sustainability without sacrificing strength. Even at under two pounds, it delivers comfort and warmth for deep cold overnights.