Thank you for viewing! #☆Nike☆'s other products are here ♡ M size Ice Neck Ring Cool Neck Cooler Heatstroke Prevention Also for sudden fevers! 【High-Quality Material & Refreshing, No Condensation】 This cool neck ring uses the latest "PCM material". While the temperature of general substances rises with the surrounding humidity, PCM stops at a constant temperature even if the surrounding temperature rises, absorbing heat and maintaining a constant temperature. Also, it doesn't condense, so it won't wet your clothes while in use, keeping you refreshed. The cool neck ring freezes naturally below 28°C and is an item that can be used repeatedly both indoors and outdoors. 【Easy to Use & Long-lasting Cooling】 Also, the neck has the carotid artery, and cooling this area can cool the blood flowing throughout the body, effectively cooling the whole body and preventing heatstroke. Cooling duration: 15-20 minutes in the freezer or refrigerator, about 20 minutes in ice water or cold water! Usable for 60-120 minutes based on an outside temperature of 25-40°C. 1-43