... instant cold pack helps to reduce body temperature and relieves pain and swelling, convenient to use while driving, traveling, fishing, hiking ... , or camping. 2. Appilcation range: (1) Minor scrapes and bruises, muscle aches and sprains, toothache, headache, calenture, stanch, edema (2) Minor ... get cold to -4 within 5 seconds, and keep cold for a long period 2. Flexible after cooling and contact skin ...