N-Ferno 6992 Toe Warmers, 7 hrs.Box of 40 Pairs Warmers are made specifically for the toesan area most at risk for hypothermia Adhesive toe warmers attach to socks for easy and durable wear Hot packs fit inside any shoe or work boot without adding too much bulk Packs activate quickly when exposed to air (no batteries required) Small warmers easily fit into work bags or jacket pockets Disposable Non toxic made with all natural ingredients Keep warm while on the job or while enjoying