Application :- Cold :- Store In Freezer So that The Pack is Ready to Use In Case of In Jury. Approximately 1 Hour is required to freeze gel ideal to use For :- Reducing swelling Toothache Temporary relief of headache Reducing fevers Hot :- Bring water to boil remove from heat and immerse the gel pack for Approximately 4-10 minutes after 4 minutes check every 1 minute to see if the correct temperature has been reached ideal to use for :- Temporary Relief of muscle aches and pains Back pain sinusitis and menstrual cramps Contents :- CMC Sugar & Water.