Marmot Voyager 55 Mummy Sleeping Bag. The ultra-packable Voyager 55 Sleeping Bags perform in cool and damp conditions thanks to SpiraFil high-loft insulation. The unique blend of large, spiral hollow fibers and small polyester fibers provides the exceptional warmth, softness, and compressibility of natural down while increasing moisture resistance. The Voyagers are also EN rated as comfortable for men at a lower limit of approximately 55 degrees Fahrenheit. They feature a full-length, locking YKK two-way zipper with a zipper garage, dual hang loops, and a blanket-like feel for all-night comfort. Rounding out these excellent bags: ?feely? draw cords and an included stuff sack that compresses for convenient packability. The ultra-packable Voyager 55 Long Sleeping Bag performs in cool and damp conditions thanks to SpiraFil high-loft insulation. The Voyager is also also EN rated as comfortable for men at a lower limit of approximately 55 degrees Fahrenheit. Polyester Imported Spirafil high loft Insulation for Maximum warmth and durability Lightweight- highly compressible bag ideal when space and weight are at premium Full length locking YKK two way zipper Feely" draw cords En tested (European norm)