Relieves muscle soreness and tension in the back, neck, and waist area. Made out of high quality fabric, which is soft, skin-friendly, and durable. Great for those with back and waist pains and sensitive skins. Pillow is able to be taken off and washed in the washing machine using normal washing methods. . Requires two D Cell batteries for usage. (Batteries not included) Size: 12 in. x 12 in. x 4 in. Color: Navy