[face fabric] 10D recycled nylon Made in the USA or Imported Cold-weather sleeping bag for alpine backpacking and mountain trips 800-fill goose down provides high warmth-to-weight insulation 10D recycled shell fabric reduces weight and improves packability Performance mummy shape maximizes warmth efficiency Contoured footbox improves comfort and heat retention Cold alpine nights demand warmth we can trust after long days in the mountains. Mountain Hardwear built the Phantom 15 Sleeping Bag to provide reliable cold-weather insulation for alpine traverses, hut trips, and multi-day backpacking missions where pack weight matters as much as warmth. High-lofting 800-fill goose down traps heat efficiently while remaining highly compressible for efficient packing. A lightweight recycled shell keeps bulk low without sacrificing durability, and the performance mummy shape maximizes warmth by minimizing empty space inside the bag. A contoured footbox follows the natural position of our feet, while a down-filled draft collar and face gasket seal in warmth when temperatures drop overnight.