Down fill, about 1.5 lbs total weight. Converts to comforter or to double sleeping bag with coupler (not included). Excellent bag for hut trips, travel, summer adventures. The item “Western Mountaineering Mitylite Sleeping Bag 40 Degree Down Green 6′ 3 USA” is in sale since Sunday, June 23, 2019. This item is in the category “Sporting Goods\Outdoor Sports\Camping & Hiking\Outdoor Sleeping Gear\Sleeping Bags”. The seller is “coski3″ and is located in Denver, Colorado. This item can be shipped to United States.