Using a nearly indestructible and durable foam, the Therm-a-Rest(R) RidgeRest(R) Classic Sleeping Pad endures in the harshest of conditions. A closed-cell design creates a long-lasting life and ridges increase the soft feel with valleys that trap warm air for a comfortable sleep. The foam used in the design creates a lightweight frame that makes packing and transporting the RidgeRest Classic Sleeping Pad easy for any outdoor activity. FEATURES: Lightweight foam sleeping pad Light for packing and carrying Ridged design provides maximum comfort Valleys in the design help lock in warm air Durable foam lasts for years of consistent use Regular weighs 14 oz. and measures 20" x 72" Large weighs 1 lb. 3 oz. and measures 25" x 77" Model: 3610