Ergodyne's N-Ferno 6990 Air-Activated Hand Warmer Pack (1 Pair) helps workers and outdoor enthusiasts stay productive when temperatures drop by providing convenient portable heat wherever it is needed. Simple to activate and easy to carry, these hand warmers offer reliable performance throughout extended outdoor tasks while helping improve comfort during prolonged exposure to cold environments. Their disposable design makes them an excellent addition to winter work gear, emergency kits, travel bags, and seasonal outdoor equipment.