Flat toe warmers have a thin design with a unique rounded toe and adhesive backing that sticks to the outside of your sock, or under or over your toes. Fits comfortably in shoes or boots. Up to 5 hours of heat. Safe, natural heat is environmentally friendly and odorless. Warmers are standard equipment for skiers, snowboarders, hunters, campers, hikers, birdwatchers, or anyone who enjoys outdoor activities. Packaged as a pair.