The Snugpak Special Forces 1 32 Degree Mummy Sleeping Bag is part of a modular system comprising of two sleeping bags. Alone this bag can be used for warmer climates but when combined with the Special Forces 2, it forms the Complete system for colder, extreme climates. FeaturesUse together in extreme conditions or separatelyZips together easilyComes with compression stuff sackComfort level of 41 degree F