- To activate, just open the pack
- All natural ingredients heat up when they make contact with oxygen
- Seal from oxygen in resealable bag and reuse the next day
- Stays warm up to 5 hours
![Ergodyne N-Ferno Warming Packs, Foot, 5 in x 2 in, Non-Woven Fabric Polyethylene, 40/CA, #16992 Ergodyne N-Ferno Warming Packs, Foot, 5 in x 2 in, Non-Woven Fabric Polyethylene, 40/CA, #16992](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/249855/354638/150-16990__24137.1595360434.jpg?c=2)
ERGODYNE
Ergodyne N-Ferno Warming Packs, Foot, 5 in x 2 in, Non-Woven Fabric Polyethylene, 40/…
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