Sea To Summit Ultralight sleeping mats use a single layer of medium resolution Air Sprung Cells™ to give you the lightest and smallest packed-volume mat, without compromising your comfort. For warmth, they use Exkin® Platinum, a quiet non-woven fabric that reflects radiant heat loss back towards your body, and Thermolite® insulation that prevents convective heat loss between your body and the ground. All Sea to Summit sleeping mats come with a quality stuff sack, a repair kit containing six self adhesive patches for repairing punctures in the field, and a spare silicone one-way valve flap.