REIs lightest, most compact womens pad optimizes warmth, compressibility and weight. Women-specific design helps you stay warm with increased insulation and padding in torso area, a key heat-loss area for women. Foam insulation is cross-cored for maximum compressibility and weight reduction. Low-volume, tapered, mummy shape increases efficiency and compressibility. Quick-closing, high-volume airflow valve allows the pad to inflate and deflate quickly. Rugged Taslan nylon diamond-ripstop 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. R-value rating is 3.2. Stuff sack included protects pad during transport and ensures a compact parcel every time.