The Comfort Light sleeping mats feature hybrid layer Air Sprung Cell(TM) technology - a double layer of high resolution cells in the torso for maximum comfort and insulation, and single layer of medium resolution cells in the head and legs for reduced weight. 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. Features: Multi-function valve for easy inflation, deflation and fine tuning of air pressure Thickness: 2.5 in / 6.3 cm 40D rip-stop nylon face fabric offers the right balance between weight and durability Our TPU lamination process - one used in the medical and aeronautical industries but unique to the outdoor industry - is vastly superior to the roll-to-roll lamination process that is commonly used in outdoor products at present. The TPU bonds better and more consistently, virtually eliminating delamination issues. Extended storage instructions: mat should be laid flat, folded as few times as possible with valve open