The Sea to Summit Ether Light XT Extra-Thick Air Mattress is a lightweight, warm-season sleeping pad for backpacking, camping, and bike touring. 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 flexible loops that create large air pockets, providing a plush, deep sleeping surface that is ideal for side sleepers. 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. Best for summer and warmer weather adventures; R-Value of 1.2 (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 Air Mattress is available in three sizes: Small measures 66 x 21.5 x 4 inches, packs to 3.5 x 7.5 inches, weighs 0.8 pounds; Regular measures 72 x 21.5 x 4 inches, packs to 3.5 x 7.5 inches, weighs 0.86 pounds; Large measures 78 x 25 x 4 inches, packs to 4 x 8.75 inches, weighs 1.1 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.