Fill a large pot with enough water to fully submerge the pack without touching the bottom of the pot. Bring water to a boil and remove pot from heating surface.  Do not immerse pack while water is being heated. Use a blunt, nonmetallic tool to submerge and remove the pack from the water. Do not leave pack unattended while heating.

Submerge pack for the 1-2 minutes. If pack has not reached desired temperature, submerge again (in same water) for an additional minute.

Do not allow the pack to come in contact with the pot or heat source for prolonged time, excessive contact may rupture the pack.  Towel dry pack before placing into the purple cover and applying to the body. Always inspect the pack for signs of damage or leaking prior to use and discard if damage is found.  Always test the pack temperature before application and allow to cool if needed.