3 SEASON ULTRALIGHT SLEEPING BAG. The cool weather sleeping bag is made with materials which do not retain moisture nor does it allow external moisture to sip in. This is due to polyester usage on the external and internal lining. In addition, it has hollow cotton filling, giving it a temperature rating of +15°F and +40°F.FITS ANYONE UP TO 64: This long sleeping bag is one of the biggest and widest out there, great for tall guys and active sleepers who like to move around. Dimensions: 83 x 33 inCOMPRESSED SACK: Convenient internal stuff pocket