Nylon Imported 【Warmer Design】-- Combination of envelope and mummy sleeping bag—The mummy's upper body fits the head more compactly and keeps warm; the Rectangular lower body can move or expose the feet. Our sleeping bag is large enough and comes in two sizes: 82.7” x 29.5”(Medium) / 86.6” x 33.5”(Large). 【Duck Down Filled】-- Selected the best duck down, no odor and impurities, safe and healthy for adults and kids. 650 fill power, STAY WARM AND DRY. Temperature for Comfort: 41℉ (5℃); Limit: 33.8℉ (1℃). 【Ultralight & Portable】-- Weight only 1.67lbs(Medium) / 1.95lbs(Large), super ultralight and portable. Each sleeping bag comes with a storage bag and a compression sack, packed size only 13.8” x 6.3”(Medium) / 13.8” x 7.1”(Large). SAVE SPACE AND WEIGHT for your backpack. 【Long Lasting Durable】-- Made with the high quality 400T 20D ripstop nylon material, comfortable and waterproof. ZIPPERS: YKK. Easy to carry for various outdoor activities, such as camping, backpacking, hiking, adventure, mountaineering, traveling, etc. It is also a great choice for hotel use. Naturehike Ultralight Down Cold Weather Sleeping Bag, 650FP Compact Sleeping Bag 3-4 Season for Adults & Kids, Waterproof - Backpacking, Camping, Hiking, Traveling with Compression Sack