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 zi...