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. The Marmot Trestles Elite Eco 0 Degree Synthetic Sleeping Bag is most sustainable sleeping bags, without sacrificing up-mountain performance or durability. HL-ElixR ECO unique blend of 100% recycled fibers provides maximum warmth, soft feel & 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 & room for your feet, for more warmth & comfort En tested Combination wave construction top provides maximum loft and warmth 3D hood construction External stash pocket Snagless insulated draft tube Two hang loops Compression stuff sack Storage bag Lifetime warranty against manufacturer defects