... warmer for hot packDesigned for healthcare and warmth-keeping,skiers, hunters, fishermen, golfers, or people who work or play in the cold for ... salt, warterDirections:1.Simply open the outer package, and expose the heat pack to air.2.Waiting for 5 minutes, the ... service We can make different heat pack with different size and shape and change the heating hours and temperature range accroding to your ...