Western Mountaineering's Badger MF 15 Degree Down Badger Sleeping Bag has more room in the shoulders and hips than traditional mummy bags, so you can move around while you sleep. Ideal for spring, summer, fall, and even winters in the desert, the Badger's 850+ down insulation has the loftiest fill rating, resulting in the highest warmth to weight ratio available on the market. Unlike most water-resistant shells, Western Mountaineering's MicroLite XP fabric offers long-lasting weather protection. The MicroLite XP shell helps the down retain its lofty warmth in moisture-riddled environments.