The Ultralight sleeping mat range has a single layer of medium resolution Air Sprung CellsTM to give you the lightest and smallest packed-volume mat without compromising comfort. These mats are ideal when going light and fast is your aim and getting a great night's sleep is essential for the next day's adventure. 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. Details. Multi-function valve for fast and easy inflation, deflation and fine tuning of air pressure. 40D rip-stop nylon face fabric offers the right balance between weight and durability. The 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.