... bag into microwave oven to be warmed for 100 seconds for each time, and for 60 seconds when be used continuously.2 ... .Purpose:Cold compress: physical therapy for traumatic hemorrhage, heatstroke, itch, headache, strain, scald, fatigue. ... -18 conditions, and can be repeatedly used alternately for hot and for cold.Non toxic.Non-caustic. heat pad reusable/pocket hand warmer