What Our Gearhead(R) Experts Are Saying:"I bring the Ultra 6. 5R Mummy when I want the warmest pad possible without the bulk. The tapered shape cuts weight and pack size, but I still sleep warm even in single-digit temps. It's ideal for winter backpacking or fast-moving alpine pushes."When our route includes frigid temps and fast miles, the Ultra 6. 5R Mummy Sleeping Pad from EXPED keeps our sleep system ultralight and cold-ready. Designed with a tapered mummy shape to trim unnecessary bulk, this pad delivers exceptional insulation and comfort without weighing us down. Using SynMat Plus Technology(TM), the Ultra 6. 5R Mummy combines recycled microfiber insulation and heat-reflective foil to achieve an impressive 6. 4 ASTM R-value-rated down to -4degF. The 3. 5-inch thickness cushions against frozen ground, while the bluesign(R) approved 20D recycled ripstop polyester shell holds strong through repeated use. With pack-friendly sizing and reliable warmth, it's a critical piece of kit for solo winter backpackers and alpine minimalists.