ULTRA COMFORTABLE: Our sleeping bag offers a great warmth-to-weight ratio, is highly compressible and is extremely durable. SPECIAL DESIGN: Envelop design for more leg space. A left and a right sleeping bag can be zipped together to make a double and incorporates comfort sleep system. Waterproof, weather resistant design with adjustable drawstring half circle hood and velcro to keep you warm even in extreme conditions. Full zip open, can be used as a quilt, double-open zipper can also make your