Stay warm in colder months with the Legami SOS Winter Hand Warmer - Rainbow. Giving an instant sensation of heat when activated, press the metal plate and wait for it to heat up, after which it will stay warm for about 30 minutes. To reuse, remove its outer cover, wrap it in a cloth and place in a pan of boiling water for 5 -10 minutes, until the contents of the hand warmer turn into liquid.