Features of the Sea to Summit Trailhead ThII 30F Sleeping Bag Tapered rectangular shape for more space and comfort than a traditional mummy bag Full length 5 YKK zip allows bag to open out flat and be used as a quilt Second zip slider in footbox for versatile ventilation WaveLoft construction for extra warmth and loft Lining fabrics attached to shell prevents tangles Oversized zip draft tubes with anti-snag 30D DWR Nylon shell and 20D Nylon lining Are lightweight and very compressible fabrics Includes stuff sack