Sold by the Case- of 40 Pairs    

Just open the pack and the all-natural ingredients in these N-Ferno® Warming Packs instantly heat up. They're activated by oxygen and will provide hours of radiant heat. They'll fit in N-Ferno™ Winter Liner ear pockets, in boots and gloves - anywhere heat is required. The non-toxic warming packs are disposable. Warming Packs heat for up to eight hours; Foot Warmers, up to five hours. One size.

• Self-contained packs add heat anywhere when exposed to air
• To activate, just open the pack
• All natural ingredients heat up when they contact oxygen
• Seal from oxygen in Zip-Loc bag and reuse the next day
• Toe style warms up to 5 hours
• Just stick them to socks, under the toes
• Disposable, non-toxic
• Specially formulated for "low oxygen" environments (footwear)