Constructed with soft, durable polyester fabrics and warm PolyLoft insulation, the Alloy sleeping bags offer a great night's sleep. Each bag features a two-layer construction to help eliminate cold spots. Additionally, each bag has a zipper baffle and chest baffle to keep your body heat inside. A convenient stuff sack is included for transport and storage. Offered in a 20deg and 0deg option, the Alloy is ready for great adventures! 4911548 Alloy 0deg 4900012 Mummy Liner - PolyCotton 4900028 Mummy Liner - Brushed Polyester