What Our Gearhead(R) Experts Are Saying:"The Mad River 15 is my ideal sleeping bag for chilly nights on the trail. The 650-fill ExpeDRY down dries quickly and stays warm even in damp conditions, while the anatomically wrapped footbox keeps my feet cozy. I love the dual-zipper system for easy ventilation and the draft collar that seals in warmth. It's lightweight, packable, and made with recycled materials-perfect for backpacking trips where comfort and sustainability matter."For those crisp backcountry nights, the Marmot Mad River 15 Sleeping Bag provides the warmth and comfort we need without weighing us down. Packed with 650-fill-power ExpeDRY down, this mummy bag delivers high-loft insulation that dries quickly and retains warmth even in damp conditions. The lightweight yet durable recycled nylon shell and lining add an eco-friendly touch, ensuring we sleep soundly while treading lighter on the planet. Designed for trail-ready comfort, the full-length zipper with a snag-free slider allows for easy entry and exit, while a short secondary zipper provides additional ventilation on warmer nights. The draft collar locks in heat, and the anatomically designed footbox with wraparound construction enhances warmth and sleeping comfort. Whether we're embarking on a high-altitude trek or settling in at basecamp, the Mad River 15 keeps us warm, comfortable, and adventure-ready.