Exped DreamWalker 250 Sleeping Bag Shell: 100% Nylon Lining: 100% Polyester. Fill: Grey Goosedown 90/ 10, Fillpower 840 cuinch Imported Unique sleeping back design that can convert to a downcoat No cold spots due to horizontal and vertical baffles Temperature rating of 4 C or 40 F Lock zippers features reflective glow-in-the-dark pulls that wont accidently open Tuck-stitch design with bar-tacking at stress points