The N-Ferno 6994 Warmer Variety Pack can provide warming relief and help regulate body temperatures for technicians working in cold conditions. Each pack contains five individually wrapped pairs of hand warmers, five body warmers and three pairs of toe warmers. The disposable, compact, non-toxic warmers are activated simply by opening the pack. The all-natural ingredients will begin to heat up as soon as they’re exposed to oxygen. Users also can shake the pack to speed up the warming process.