Thermarest Trail Scout Self Inflating Sleeping Pad - Irregular Dimensions : Small: 20 x 47 in. Medium: 20 x 66 in. Regular: 20 in. x 72 in. Large: 25 in. x 77 in. Pack Size : Small: 11 in. x 4.6 in. Medium: 11 in. x 5.4 in. Regular: 11 in. x 5.6 in. Large: 13 in. x 5.7 in. Weight : Small: 14 oz. Medium: 1 lb. 4 oz. Regular: 1 lbs. 6 oz. Large: 1 lbs. 14 oz. Thickness : 1 in. R value : 3.4