The DrySoak™ Hot Water Therapy Pillow offers the benefits of soaking in a hot tub, without getting wet. It’s a simple, effective tool that delivers deep, penetrating treatments. The therapy pillow helps relieve sore muscles, soothe minor muscle pain and cramping, and alleviate stress and tension. Each bag is constructed of a soft, pliable, double-layered, lightweight polymer plastic that is durable enough to support 600 lbs. of pressure. Hypoallergenic, No Latex, No Odor, Food-Grade Material. 2.5-gallon capacity. 15″ x 18″ heating/cooling surface area.