With its unique, detachable sit-pad, the REI Trekker Convertible pad offers lightweight sleeping comfort for backpacking, camping or traveling. 2 products in 1 Groundbreaking convertible design features a detachable 12-in. sit pad when attached to 60-in. pad you have a full-length, 72-in. sleeping surface. Horizontal-cored foam is engineered to be exceptionally lightweight and compressible and yet not compromise warmth. Quick-closing, high-volume airflow valve allows the pad to inflate and deflate quickly. Nonslip, brushed polyester upper surface is soft to the touch 75-denier polyester bottom surface resists wear. R-Value equals 4.2. Stuff sack included protects pad during transport and ensures a compact parcel every time.