This comfy cushion features a built-in massager that helps to relieve back pain. It's ergonomically designed to hug the S-curve of your spine while you're sitting or lying down and provides comfortable support and soothing massage. Great for home, office, car and travel, the ultra-plush memory foam cushion has a microbead core and breathable, stay-cool fabric. The cover is removable for machine washing. Req. 2 "AA" batteries (sold separately). Polyester & foam. 17"L x 4 1/4"W x 8 1/2"H.