HotHands® Insole Foot Warmers are full-length foot warmers designed to fit inside shoes or boots. They are single-use air-activated heat packs that provide up to 9 hours of continuous warmth for the feet. Features: Ultra-Thin, Adhesive Backing Up to 9 Hours of Heat Air-Activated, Ready to Use Great For: Skating, Skiing, Boarding, Shopping.
eBay