N-Ferno Warming Packs， 80 / Box

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， freight/baggage， drilling/mining， oil/gas refining， iron/steel work， delivery/service， landscaping/grounds， cold storage/warehousing and material handling