This gel pillow can be used for both hot and cold. The FFC Activated Water Gel delivers comfortable warmth and cold temperature in both hot and cold. Can be heated in the microwave while in the cover. The cover will not melt at a temperature of 200 degrees. When kept in a household freezer, it cools from -10 to -20 degrees Fahrenheit and will not freeze it. It is soft even when heated or chilled in the freezer, and fits anywhere on your body. The brushed cover is soft and retains heat and is resistant to high and low temperatures. Can be used repeatedly. Examples: Use it on your shoulder, sleep, forehead, or pillow. Product Number: ODH-600DXY; Set Contents: Cover: 1, Gel Bag: 1; Size: Body: W9.8 x H6.3 x D1.0 inches (250 x 160 x 25 mm); Weight: 22.2 oz (620 g); Materials: Gel Bag: Activated water, multi-cost alcohol, polymer absorbent resin, polyethylene cover: polyester. How to use: Heating time (output: 5000 - 60 seconds per minute. 700 W sec. ~800W/1min/1min/900W-1000W/50sec/50sec/50sec/Set the gel bag on the cover and place one in the middle of a clean plate. Please make sure to check the high frequency output (wattage), and then heat it. Heat it upside down after the surface is heated, and do not heat any of the above heating times. If the bag gets inflated or bursted, turn off the switch immediately, and then allow sufficient amount of time before opening the stove door. When reheating in warmth, heat up to room temperature (about 48°F (20°C)), set the microwave for 20 seconds at 500 to 600 W, 700 to 1000 W, and then heat with eyes. When removing it, do not hold it with bare hands, use a pot holder, etc. ★Cooling Method: Set the gel bag on the cover, place it in a plastic bag, etc., and let it cool for more than 6 hours in the freezer. Caution: Please do not overheat in the microwave or heat with other items. The bag will burst. Please be sure to follow the precautions before use. Please make sure to check the high frequency output (wattage), and never heat it outside of the heating time specified in the usage method. Overheating by mistake may cause the bag to burst and cause hot contents to scatter and burn. Heating in automatic mode (auto mode or unset mode) will be overheated. Please do not use this product. Please follow the reheating methods indicated in the usage method. Please do not use this product if there are skin problems such as injuries or eczema. If you experience any abnormalities during use, stop using and consult a physician. If the gel gets in your eyes or mouth, wash it thoroughly with water, and consult a physician if you experience any abnormalities. Do not eat the contents of the gel bag. Do not put the gel bag directly against your skin or apply it to a certain area for a long time (there is a risk of low temperature burns). Can be exposed to strong impact or sharp