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N-Ferno® 6990/6992 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.