Updated for 2014 to be even warmer and more comfortable, the Therm a Rest Trail Pro is a self inflating, trail friendly sleeping pad built with the most advanced foam available to save space and weight in your pack without sacrificing any comfort. New, patent pending, diagonal cut foam traps up to 25% more heat than standard, vertically cut channels by slowing the exchange of warm and cold air beneath you. Atmos foam is vacuum poured to ensure the most uniform, high loft, and compressible foam possible, resulting in is foam thats warmer, lighter, and more compressible than other foams of equal thickness. Expanding foam core self inflates top off with just a few breaths for personalized firmness. 2 inch thickness provides a high level of warmth, comfort, and support. R Value: 4.0. Topbottom fabric: 75D polyester. Core: diagonal punched urethane foam. Stuff sack included. Made in Seattle, WA.