Usuing the cool time ✅Automatically cooled to a temperature below 18℃. ✅Leave it in ice water for about 10 minutes and in the freezer for about 20 minutes. ✅Freezes in air conditioner or cold water from the water purifier. ✅The temperature is maintained at 18°C, so it is not cold like ice or irritates the skin. ✅No sewing line, so it is not irritating to the skin when worn. ✅Doesn't burst even if you step on or twist the tube. ✅Skin non-toxicity test has been completed. ⚠️Safety warning⚠️ ✅Avoid sharp objects. ✅Avoid open flames and excessive heat. ✅If your skin is exposed to PCM gel(refrigerant), clean the affected area with soap and water. If you have eczema(atopic dermatitis) see your physician if irritation persists. ✅Do not swallow the contents (if swallowed, report to a hospital immediately and consult your physician) ✅Use only for original purpose.