Quick view Add to Wishlist Tenacious Holdings, Inc Ergodyne 16990 Ergodyne N-Ferno Warming Packs Ergodyne N-Ferno Warming Packs - 2" - 80 / BoxFeatures:Easy activation - simply openAll-natural ingredients heat up when they contact oxygenSeal from oxygen in Zip-Loc bag and reuse the next dayHand style warms up to 8 hoursGreat for cold storage workers... MSRP: $56.19 Add to Cart The item has been added Compare