Newly modified with the new the WingLock™ Valve Technology from Therm-a-Rest the Trail Lite sleeping mattress provides the ideal balance of weight, warmth, comfort and durability with an outstanding combination of comfort, weight and pack size making the Therm-a-Rest Trail Lite one of the best performing all-around self-inflating camping mattresses on the market. Die-cut foam reduces weight and bulk while self-inflation adds convenience you’ll appreciate at the end of the day and the semi-rectangular shape which increases the sleep area and also makes for better, gap-free matching of other rectangular mattresses next to each other. Therm-A-Rest Trail Lite (Regular) Features: 50D Polyester Fabric Die Cut Urethane Foam New WingLock™ Valve Technology Stuff Sack Included Dimensions 51cm x 183 cm Packed Dimensions 28cm x 15cm Thickness 3.8 cm R-Value 3.2 Weight Approx 740g