VINQLIQ 40-60 Degree 3-Season Warm Envelope Sleeping Bag Lightweight Waterproof with Compression Sack for Cold Weather Travel, Outdoor, Hiking, Camping and Backpacking polyester taffeta 3-SEASON, 40- 60 AND NON- DEFORMING FILLER - Filling with one piece quality hollow cotton which is not easily deformed, good warm performance ( keep you comfortable at temperatures between 40 degrees Fahrenheit and 60 degrees Fahrenheit ) and durable. WATERPROOF AND BREATHABLE - 190T polyester taffeta with waterproof coatingshell fabric which has a good performance for waterproof and breathable. Effective to use under the bad environment. COMFORTABLE AND SAFE - Liner is made of terylene/cotton which provides good comfort and warmth. The liner fabric is 100% safe to your skin for its better skin affinity and surrounds your skin with softness. LIGHTWEIGHT AND EASY TO CARRY Small volume and light weight, easy to compress, convenient to carry MULTIPURPOSE - Full zip open, this sleeping bag can be used as a mat, a quilt or a blanket. Two sleeping bags can be zipped together to as a two person sleeping bag.