What Our Gearhead(R) Experts Are Saying:"The Trestles Elite Eco 0 is my go-to for winter backpacking and mountaineering. The HL-ElixR ECO insulation keeps me warm even in freezing conditions, and I love how the 3D footbox gives my feet extra room and warmth. The secondary zipper is great for ventilation when I don't need full coverage, and the anti-snag design makes getting in and out effortless. It's warm, lightweight, and eco-friendly-everything I want in a cold-weather sleeping bag."Cold nights in the backcountry demand serious warmth, and the Marmot Trestles Elite Eco 0 Sleeping Bag delivers. Built for extreme conditions, this ultrawarm synthetic bag features 100% recycled HL-ElixR ECO insulation, blending three types of fibers for maximum loft, softness, and heat retention. A PFC-free, recycled polyester shell and lining make it an eco-conscious choice without sacrificing durability or performance. Thoughtfully designed for comfort and efficiency, the bag features a 3D anatomically shaped footbox for extra warmth, while wave construction on top and blanket construction on the bottom optimize insulation and comfort. The fold-down secondary zipper offers easy access and ventilation when we need it, while the insulated draft tube and 3D hood seal in heat when temperatures plummet. Lightweight and compressible, the Trestles Elite Eco 0 is built for winter camping, alpine expeditions, and cold-weather treks where warmth and sustainability matter most.