【Premium Down Sleeping Bag】The backpacking sleeping bag with ultralight 650FP white duck down 90/10 filling, nature's best light insulator with the highest warmth-to-weight ratio to beat the cold weather. Filled with vertical lining structure, let the feathers are more fluffy, keep you warm and insulated all night. Extreme Limit is 16℉/-9℃, Lower Limit (men) is 39℉/4℃, and Comfort Limit (women) is 48℉/9℃.