Description Gear up for your next high altitude or colder latitude adventure with the Alpine Down Sleeping Bag. The expedition mummy fit provides ample space for winter gear, while the modified Free-Flow Zip system provides ventilation and versatility. Complex construction throughout and 850+ fillpower, RDS-certified PFAS-free Ultra-Dry Goose Down delivers maximum warmth retention. Features RDS-certified, 850+ fillpower goose down with a non-PFAS Ultra-Dry Down treatment for maximum thermal performance Recycled 20D nylon shell material with a non-PFAS DWR is light and durable. Hood and footbox have a highly water resistant, breathable fabric for extra moisture protection - ideal for bivvies or snow caves Roomy expedition mummy fit provides plenty of space for you, performance clothing and gear you don't want to freeze Highly breathable liner for enhanced comfort Free-Flow Zip System: Full-length zipper with half-length zipper on opposite side for excellent temperature regulation Technical hood and footbox, efficient mummy shape and generous draft tubes on the zippers maximize warmth retention Sea to Summit Guarantee is offered for the Lifetime of this product Specifications Weight: 1.459kg Comfort Temperature Rating: -19 Celsius Lower Limit Temperature Rating: -29 Celsius Max User Height: 185cm Fill Power: 850+ Temperature Rating Comfort The temperature at which a standard woman can expect to sleep comfortably in a relaxed position. If you are female or consider yourself a cold sleeper, use this rating to decide the coldest temperature the sleeping bag is suitable for. We emphasise the Comfort temperature for our women’s specific sleeping bags. Lower Limit The temperature at which a standard man can sleep for eight hours in a curled position without waking. If you consider yourself a warm sleeper, use this rating to decide the coldest temperature the sleeping bag is suitable for. We emphasise the Lower Limit temperature for all our unisex sleeping bags. Sea to Summit Alpine Down Sleeping Bag