This sleeping bag series uses the waterproof and breathable material "AURORA LIGHT" proprietary by NANGA. This envelope style model is perfect for camping or sleeping in the car. It has an L-shaped zipper, so it can be opened wide and used. It can also be used on top of the mummy-shaped sleeping bag for a wide variety of seasons. [SPEC] Outer Fabric: 20dn Auroralite, Lining Fabric: 20dn Nylon Taffeta, Feathers: DX (90% Down, 10% Feather), 760 FP, Structure: Box Quilt Structure, Size: Regular Size (Compatible with 70.9 inches (180 cm)), Feather Volume: 28.2 oz (800 g). *BLK lining is red.