Extra-thick and extra-warm 4-inch air mattress provides a plush, women’s-specific sleeping surface for winter (6.3 R-Value) backpacking and camping Single-layer Air Sprung Cell construction mimics a spring mattress; women’s pad cut is narrower at the shoulders and wider around the hips and knees Multi-function valve for fast inflation in just a few breaths (using integrated Airstream Pumpsack), one-way deflation for quick packup, and fine-tuning of air pressure Insulated pad features high-loft fiberfill and reflective fabric, to prevent heat loss and radiate heat back during sleep; non-slip 30D/40D nylon face fabric is durable and quiet Regular size measures 66 x 21.5 x 4 inches, packs to 6.9 x 9.4 inches, weighs 1.5 pounds; includes stuff sack, field repair kit, and PillowLock patches for securing a Sea to Summit pillow to mat The Sea to Summit Ether Light XT Extreme Cold-Weather Insulated Women’s Air Mattress is an extra-thick and extra-warm 4-season sleeping pad for winter backpacking and camping. Its Air Sprung Cell construction mimics a spring mattress, maintaining more body contact area and even dispersion of pressure for restful backcountry slumber. At 4 inches thick, the sleeping pad features a single-layer design with fully-insulated flexible loops, providing a plush, warm sleeping surface; pad is shaped specifically for women, cut narrower at the shoulders and wider around the hips and knees. The multi-function reversible valve allows for fast and easy inflation—with the integrated Airstream Pumpsack which inflates the pad in just a few breaths—one-way deflation for quick packup, and fine-tuning of air pressure for a good night’s sleep. The insulated pad features Thermolite insulation which lofts up inside the Air Sprung Cells to prevent convective heat loss to the cold ground (women’s pads have a thicker layer of insulation than unisex pads), as well as Exkin Platinum reflective fabric which radiates heat back during sleep (R-Value of 6.3—the higher the R-value, the warmer the sleeping pad). Non-slip 30D/40D nylon face fabric is durable and quiet. The Sea to Summit Ether Light XT Extreme Cold-Weather Insulated Women’s Air Mattress is available in two sizes: Regular measures 66 x 21.5 x 4 inches, packs to 6.9 x 9.4 inches, weighs 1.5 pounds; Large measures 72 x 25 x 4 inches, packs to 7.3 x 11 inches, weighs 1.9 pounds. Includes stuff sack, field repair kit, and PillowLock patches for securing a Sea to Summit pillow to mat. Sea to Summit products are guaranteed against defects in materials or workmanship for the lifetime of the product.