Ergodyne EGO16990 Hand Warming Packs 40/Carton White

Ergodyne N-Ferno Hand Warmers 40-Carton

These self-contained warming packs are designed for anyone who needs reliable heat during cold outdoor work or recreation. Each pack activates on contact with air and delivers warmth for up to 12 hours using all-natural ingredients. The carton contains 40 individual white warmers measuring 2.17"W x 3.74"D. They suit workers, hikers and commuters facing freezing conditions.

Activation and Reuse Simplicity

Opening the pack exposes the activated carbon to oxygen, starting the heating process immediately with no external power or preparation required. If warmth is only needed briefly, the partially used pack can be sealed in an airtight container to pause the reaction for next-day reuse. The main risk is leaving an opened pack exposed to air unintentionally, which will exhaust its 12-hour lifespan prematurely. Users should carry a small zip-lock bag for proper storage between uses.

Sustained Heat Output Over Time

Once activated, the warmers produce a steady temperature for the full rated duration rather than a short intense burst followed by rapid cooling. The natural ingredient composition maintains consistent output across the 12-hour window, making them suitable for full shifts or extended outdoor sessions. Performance depends on ambient airflow; tightly insulated pockets may moderate peak temperature while extending total runtime. They are not designed for applications requiring adjustable or instantaneous high-heat spikes.