N-Ferno 6992 Toe Warming Packs

All-natural ingredients heat up after contact with oxygen. Just open to activate. Hand-style packs heat up to 8 hours, toe-style packs heat up to 5 hours. Ideal for use in winter liner ear pockets, boots or gloves. Seal from oxygen in ZipLoc® bag and reuse the next day. Easy to dispose packs contain no toxic materials.