The Big Agnes Anthracite 20 degrees Sleeping Bag is a traditional-style mummy bag filled with warm, FireLine Pro Eco recycled synthetic insulation. This innovative insulation is made with multi-denier, short-staple fibers with high loft to efficiently trap heat, and silky fibers provide a soft feel and great compression for packability. This bag is lightweight, warm and compressible for life on or off the trail. FireLine Pro Eco recycled synthetic insulation is made with multi-denier, short-staple fibers with high loft to efficiently trap heat Recycled polyester ripstop shell with PFAS-free water-repellent finish Lining made from recycled polyester with a PFAS-free water repellent finish Contoured hood follows the shape of your head for a more comfortable fit Warmth rated to 20 degreesF Traditional mummy shape allows for light weight and increased body heat retention Oversized no-draft collar and no-draft zipper to keep the cold out Low-profile cordlock lets you uncinch the hood with one hand Insulated tube along upper hood opening seals out drafts when cinched 65 inch YKK anti-snag locking zipper for a smooth, quick zip Two-way zipper and Zipper Garage positioned on sleeper's left side of bag Mate together left- (All-Gender) and right- (Women's) zip bags to share warmth with your tent mate Interior loops for securing a liner for added warmth (sold separately) Exterior loops for hang drying or storage Order today!