Insole Foot Warmers - Up to 10 Hours of Heat, Easily Apply with Adhesive - Ultra Thin, Easy, All Natural - Air Activated, Odorless Hot Insole Warmers - Sport TempCONTAINS: 20 Pairs of Insole Warmers. SUPER LONG LASTING HEAT: Up to 10 hours of heat, warming your feet. TRAVEL FRIENDLY: TSA compliant & USA safety approved. Easy to stow and store in a backpack, luggage, or jacket pocket. EASILY APPLIED: Tear open outer package, remove warmer, apply adhesive. Warmer heats up in 15 30 minutes. Keep warmer in oxygen restricted environments such as shoes or boots to maintain heat Dispose in regular garbage.