SGH680 N-Ferno 6995 Foot Warming Packs Hours of Effective Warmth: 7 hrs. ERGODYNE #16995
- Hours of Effective Warmth: 7 hrs.
- Self-contained packs activate when exposed to air
- All natural ingredients heat up when they contact oxygen
- Seal from oxygen in resealable bag and reuse the next day
- Provides warming to the full foot and will fit in boots or shoes