Hot & Cold Gel Pak--4x6 InchFor use in relieving pain and swelling due to injury.Cold Use:Place in refrigerator or freezer for 1-2 hours prior to use. Remove and wrap Gel Pak in cloth and apply to affected area. Treatment time should not exceed 30 minutes. Repeat as necessary.Hot Use:Place Gel Pak in microwavable container and cover with water. NEVER HEAT GEL PAK IN MICROWAVE OVEN WITHOUT COVERING IN WATER. Microwave on high for one minute. Remove Gel Pak and cover with cloth and apply to affected area.