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This neck ring is made of durable TPU wrapped in acetic acid, which dissolves from solid to liquid at temperatures above 48℃.<br>
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The neck area has a concentration of large blood vessels and pressure points that promote blood circulation. Due to the flow of blood throughout the body, the entire body is warmed and the body temperature can be expected to increase. <br>
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It can absorb heat just by placing it in hot water at room temperature of 80℃ or higher. <br>
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There is no need for any power supply, and the neck maintains a temperature of 48℃, which can be maintained for about 60 to 120 minutes after freezing. If it's not warm enough, you can refreeze it and use it as many times as you like.