When you&';re making an epic ascent or trek, you want a sleeping bag that will keep you comfortable when the temperatures really start to drop. We&';ve taken our best-selling Trestles Elite Sleeping Bag series and made our most sustainable sleeping bags ever, without sacrificing up-mountain performance or durability. The Trestles Elite Eco 0 Sleeping Bag is an environmentally friendly update which features Marmot Upcycle PFC-free and recycled shell, lining, and fill. HL-ElixREco Micro synthetic insulation uses a unique blend of three fibers for maximum warmth, soft handfeel, and high loft. Wave construction on top and a blanket construction on the bottom provide optimal warmth and comfort. An anatomically 3D footbox and a fold-down secondary zipper offer ventilation and easy access for this mummy sleeping bag. We designed the Trestles Elite Series for treks where every ounce counts, so we kept the lightweight and easy compressibility of the original. EN rated as comfortable for women to the comfort level of approximately 15.6 deg F and to a lower limit for men of approximately 2.3 deg F. Features HL-ElixR(TM) Eco Micro recycled synthetic insulation blends 3 different fiber types for high loft, maximum warmth and a soft feel, without giving up weight or compressibility Wave construction on top provides maximum loft and warmth, while a blanket construction on the bottom provides warmth and excellent comfort Main zipper has an antisnag slider to reduce snagging; fold-down secondary zipper offers ventilation and easy access Anatomic 3D footbox increases the insulation and room for your feet, ensuring warmth and comfort 3D hood construction extends the cozy warmth Internal stash pocket Snagless, insulated draft tube Hang loops Includes a compression stuff sack and separate storage bag Technical Specs Best Use- Backpacking Tested Lower Limit- 2.3 degrees (F) - EN Tested Comfort- 15.6 degrees (F) - EN Temperature Rating (F)- 2.3 degrees (F) Temperature Rating (C)- -16.5 degrees (C) Weight- Regular - Left Zip: 3 lbs. 8.3 oz. Shell- 20-denier recycled ripstop polyester Zipper Location- Left Insulation Type- Synthetic Fill- HL-ElixR Eco Micro recycled synthetic fibers Fill Weight- 2 lbs. 9.3 oz. Lining- 20-denier recycled ripstop polyester Sleeping Bag Shape- Mummy Fits Up To (in.)- Regular - Left Zip: 72 inches Shoulder Girth (in.)- Regular - Left Zip: 62 inches Hip Girth (in.)- Regular - Left Zip: 57 inches Stuff Sack Size- 9.5 x 21 inches Stuff Sack Volume- Unavailable Compressed Volume- Unavailable Gender- Unisex Sustainability- Contains recycled materials