Grabber Full Insole Foot Warmers are thin, comfortable air-activated warmers that fit inside your shoe or boot, and provide over 5 hours of soothing warmth beneath your feet. The latest addition to the best-selling Grabber line, Foot Warmers contain a revolutionary warmer technology and are designed for one-time, disposable use. | Grabber Warmers Full Insole Foot Warmers in White | Size Small/Medium