Sustainable design that doesn't sacrifice performance in cold weather around 20°F. The PFC-free, mummy-style Women's Trestles Elite Eco 20° Sleeping Bag fill is made from 96% recycled material and has the lightweight, easy compressibility of the original. HL-ElixR Eco synthetic insulation uses a unique blend of three fibers for maximum warmth, soft handfeel, and high loft. Wave and blanket construction plus a roomy footbox provide optimal warmth and comfort. A fold-down secondary zipper offers ventilation and easy access. 100% Recycled Polyester Shell and Lining fabric "HL-ElixR ECO" Unique Blend of 100% Recycled Fibers Provides Maximum Warmth, Soft Feel and High Loft Fold-Down Second Zipper Provides added Ventilation and Easy Access, Main Zipper Anti-Snag Slider reduces Snagging Anatomically 3D Footbox increases the insulation and room for your feet, for more Warmth and Comfort EN Tested Combination Wave Construction Top provides Maximum Loft and Warmth, Blanket Construction Bottom for the best warmth and comfort under body 3D Hood Construction External Stash Pocket Snagless Insulated Draft Tube Two Hang Loops Compression Stuff Sack Storage Bag