Yaktrax Disposable Adhesive Toe Warmers are a superior source of heat for anyone braving the cold. Once opened, these odorless and environmentally-safe warmers begin working within minutes, providing up to 5 hours of steady warmth. Yaktrax Adhesive Toe Warmers contain natural ingredients including iron powder, water, salt, activated charcoal, and vermiculite. Adhesive backing keeps warmers secure and in place and helps focus heat on the toes for prolonged comfort. Simply remove, peel, and stick. Yaktrax Adhesive Toe Warmers are ideal for keeping toes warm when camping, hunting, fishing, skiing, athletic events, and more. Dimensions per warmer: 3.5 x 5 x 0.25 inches.