The Marmot Trestles 15 Degree Down Mummy Sleeping Bag features SpiraFil synthetic insulation, a super, high loft insulation that is incredibly warm and comfortable. Dual zippers allow you to fold down the top, making getting in and out of your bag nice and easy. This perennial favorite is loaded with features, at a great price. SpiraFil 120 high loft insulation, EN tested. 100% polyester DWR, 100% polyester embossed DWR shell. 100% polyester embossed DWR lining. Dual zippers with two way zipper sliders and zipper guards. Insulated collar with easy access cord. Wave construction offers the advantages of both traditional blanket and shingle construction with no significant weight increase. Classic trapezoidal foot box. Compression stuff sack included. Feely draw cords. Hood draw cord. Second side zip. Snagless draft tube. Stash pocket. Two hang loops. Velcro free face muff. Regular or long length, left or right zipper. Color: Cobalt bluedeep blue.