[face fabric] 100% recycled polyester ripstop Imported Tailored Fit & Lightweight: The long model fits adventurers up to 79.2”, weighs only 2lb 11oz, and packs down to 14L 8” x 17.5”, making it an ideal compact sleeping bag for your backpacking gear kit. Optimized Side-Sleeper Construction: Features a cocoon-style design with a wrap-around zipper and an integrated "Pillow Barn" that keeps your pillow in place as you turn throughout the night. DownTek Water-Repellent Insulation: Utilizes PFC-free, bluesign approved 650 fill power DownTek and FireLine ECO synthetic insulation to maintain loft and warmth even in damp conditions. Strategic Thermal Mapping: Designed with specialized insulation placement to provide extra warmth and cushioning on the hips and feet, specifically addressing the pressure points of side sleepers. Sustainable Technical Materials: Built with a GRS certified 100% recycled polyester ripstop shell and a smooth taffeta lining featuring a PFAS-free water-repellent finish for eco-friendly durability. Specifically engineered for those who sleep on their sides, the Big Agnes Sidewinder series redefines backcountry comfort. Designed with a unique, patent-pending contoured silhouette, this side-sleeper sleeping bag moves with you as you roll, preventing the restricted feeling of traditional mummy bags. Featuring premium 650 fill power DownTek water-repellent down and strategic synthetic insulation in high-pressure areas, it provides optimized thermal efficiency and cushioning where side sleepers need it most. Whether you’re on a weekend backpacking trip or a high-alpine expedition, the Sidewinder ensures a cozy, "at-home" sleep experience in the great outdoors.