Travel light and sleep comfortably At just under a pound, the compact REI Lite-Core 1.0 pad takes up precious little space in your pack and wont weigh you down. X-Core foam insulation is cross-cored for maximum compressibility and weight reduction. Quick-closing, high-volume-airflow valve allows the pad to inflate and deflate quickly. Rugged diamond-ripstop Taslan nylon top surface has a nonslip texture 75-denier polyester bottom surface resists wear. Grippy silicone pattern on upper surface helps keep sleeping bag from sliding off pad. Low-volume, tapered mummy shape increases efficiency and compressibility. R-Value equals 2.5. Stuff sack included protects pad during transport and ensures a compact parcel every time.