Triple Layer Thermal Comfort with Waterproof ProtectionThe Therm A Seat Infusion 3 Inch Thermaseat features a triple layered design for performance and comfort. A 3 8 inch Softek closed cell foam thermal barrier retains heat while 1 3 8 inches of urethane Comfotek foam adds comfort. A rigid closed cell foam earth barrier blocks cold wet ground and a waterproof polyurethane coated outer fabric stays freeze proof in sub zero temperatures. An aluminum carabiner clip is included for easy transport. Triple layer foam construction Softek thermal barrier layer Comfotek comfort foam layer Waterproof freeze proof outer fabric Includes aluminum carabiner clip