The Advanced Mountain Kit is made with unparalleled precision for the world&&';;s best mountain athletes. Our Summit AMK Superlight Sleep System is the next step in the evolution of alpine bags. It offers a wide fit so you can wear multiple layers while you sleep, meaning the bag itself requires less insulation for a lighter overall kit. Wide cut allows user&&';;s apparel insulation to loft, which reduces the amount of insulation needed in the bag Combination of 1000 fill ProDown(TM) and a wide cut creates a multi-temperature system: 30AdegF/-1AdegC as a standalone bag; 0AdegF/-18AdegC when used as part of the AMK apparel-layering system Shell fabric made with SpectraA(R) ripstop for ultra-lightweight durability Water-resistant exterior helps keep insulation dry Center half zip keeps the bag light and compressible while maintaining access to the tie-in point Thin, down-insulated hood and footbox provide warmth Cinchable hood and collar help seal out the cold DyneemaA(R) compression stuffsack included Sizes REG, LONG Temp Rating 30AdegF/-1AdegC (0AdegF/-18AdegC when sleeper is wearing AMK apparel) Total Weight reg - 2 lbs 5 oz (1045 g) / long - 2 lbs 8 oz (1135 g) Stuffed Size reg - 8.27&';&'; x 15.75&';&'; (21 cm x 40 cm) / long - 12.2&';&'; x 18.9&';&'; (31 cm x 48 cm) Internal Length reg - 78&';&'; (198 cm) / long - 84&';&'; (213 cm) Max User Height reg - 6&'; (183 cm) / long - 6&';6&';&'; (198 cm) main body breathable-waterproof SpectraA(R) ripstop with metalized coating and non-PFC durable water-repellent (non-PFC DWR) finish lining 7D recycled nylon with metalized coating and non-PFC DWR finish insulation 1000 fill ProDown(TM); Responsible Down Standard (RDS) certified by Control Union, CU 843098 stuffsack DyneemaA(R) fabric