polyester Imported ULTRALIGHT SLEEPING BAG FOR ADULTS: Designed for comfort without the bulk, ideal for camping, hiking, and backpacking trips. COMFORTABLE and COMPACT: Roomier mummy design allows easy movement while still packing down small with the included compression sack. LIGHTWEIGHT and BACKPACKING READY: Packs easily into your hiking backpack without sacrificing warmth or comfort, thanks to efficient insulation and compact design. ALL WEATHER OPTIONS: Choose from 0 Degree, 20 Degree, or 30 Degree temp ratings and three different sizes. TETON SPORTS PROMISE: Reach out to our AMAZING product support team if you have any questions or concerns; YOU CAN COUNT ON US to get you taken care of and back OUTDOORS.