The Ergodyne N-Ferno Warming Packs are self-contained packs that add heat anywhere when exposed to air. There’s nothing like the great outdoors in winter. But when you’re cold, being outdoors isn’t great at all. N-ferno warming packs help you stay warm so you can stay, play, and work outside while achieving peak performance in total comfort. If warming time is not completely exhausted, N-ferno warming action can be preserved for several days by packing them in an airtight container, such as a zip-seal polybag. N-ferno products are packaged in their own reusable heat action preserving zip seal polybags, for your convenience.

Features:

• Just open to activate.
• Warms in minutes.
• Last up to 5 hours.
• Inexpensive enough to use every day.