Stay warm and cozy on your summertime adventure in the Micron 40. This summer bag is filled with water-resistant 650-fill-power goose down and has the ability to zip open and convert to a flat blanket with its full-length wrap-around zipper. Lightweight and durable, this easy-to-pack bag has an internal stash pocket.. . Main materials: 20d 100% Nylon Mini Ripstop. Lining: 20d 100% Nylon Plain Weave. Certified 650-Fill Power Down with Down Defender to Improve Water-Resistance in Wet Conditions. Full-Length, Wrap-Around Zipper Provides Great Ventilation and Has the Ability to Convert to a Flat Blanket. Internal Stash Pocket. EN Tested. Sewn-Through Baffles. Two Hang Loops. Stuff and Storage Sack Included. Bag temperature(degF): 40degF. Weight: 1 lbs., 9.5 oz. (723g). Pack volume: 256.3 cu. in./4.2 liters. Spot clean. Imported.