Ergodyne N Ferno Warming Packs EGO16990 Ideal for cold weather work and recreation, N Ferno Warming Packs heat up in seconds and provide continuous warmth. The self contained packs add heat anywhere when exposed to air. To activate, simply open the pack. All natural ingredients heat up when they contact oxygen. Seal from oxygen in Zip Loc bag and reuse the next day. Environmentally friendly hand warmers keep your hands warm up to 8 hours. They are great for construction, freightbaggage, drillingmining, oilgas refining, ironsteel work, deliveryservice, landscapinggrounds, cold storagewarehousing and material handling $47.62

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