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. Ingredients are harmless to the environment MULTI-USE: Perfect for skiing, snow boarding, fishing, hiking, camping, tailgating at sport events, hunting, or to stay warm in the icy cold winter weather. MULTI-USE: Perfect for skiing, snow boarding, fishing, hiking, camping, tailgating at sport events, hunting, or to stay warm in the icy cold winter weather.