HEAVY AND WARM - The Arcturus Rainier wool blanket weighs 4.5 lbs, with a density of 550 GSM (that means nice and thick). PLENTY OF ROOM FOR ALL - Large size (64" x 88") size will keep you and a friend cozy while camping, at a tailgate, football game, or an outdoor concert, or just as an emergency blanket in your vehicle. 70% WOOL - The remainder of the blanket is composed of 30% hypoallergenic synthetic fibers for durability and washability. Wool is a naturally fire-retardant material so it is not treated with any additional flame-retardant chemicals. MACHINE WASHABLE (if you must) - Every Arcturus wool blanket is triple-washed during production so you can use it right away. To keep shedding to an absolute minimum, we recommend hand washing your blanket in cold water. You may also machine wash your blanket separately in cold water on a delicate cycle and line dry. Avoid top loaders with a center agitator as they can cause damage and will increase shedding.