Sea to Summit Ultralight Self Inflating Mat Sleeping mat (Large, orange/red) - The Ultralight Self Inflating Mat from Sea to Summit is ideal when you want to keep things light! The mat is made of ultralight 30D polyester with laminated TPU. By employing the vertical Delta Coring method, Sea to Summit was able to reduce the weight of the polyurethane foam by 20%. In more stressed areas, such as the hips, shoulders and feet, the delta cores are smaller to guarantee optimum thermal insulation. In less stressed areas, the cores are larger to minimise the mat's weight and pack size. The anti-slip print on the surface and base of the mat keeps the mat and your sleeping bag in place, preventing you slipping off in the middle of the night. The Ultralight Self Inflating Mat is a self-inflating sleeping mat that won't weigh you down on your next adventure!