... relief of headachereducing fevers Application:hotmicrowave:place gel pack into microwave for approximately 30 seconds(if the ... rom temperature) or 1 minute(if the gel pack is frozen)on high power,after this teme, ... water to boil,remove from heat and immersethe gel pack for approximately 4-10 minutes,after 4 minutes ... ,temporary relief of muscle aches and pains,back pain ,sinusitis and menstrual cramps