This is the Sierra Designs Zissou 12 Long DriDown sleeping bag. This bag is designed with waterproofing treated down so you can still get the lightweight of down but the water resilient properties of a synthetic. This model in particular is long enough for people up to 6'6" as opposed to the regular which is for those up to 6'0". Has been maintained both outside and inside with special down treatment washes in HE washer from Nikwax. comes from a smoke and pet dander free home.