Innovative Technology: Our Cooling Neck Ring Uses A Unique German Technology Pcm Material. Automatically Freezing Below 18C (64F), It Freezes Faster Than Water And Maintains That Temperature As It Slowly Melts To Keep You Cool In The Heat. Easy To Use: Freezing Can Be Started Anywhere Below 18C (64F) Without Using Electricity. Even Freeze This Neck Cooling Tube Simply By Placing It In Ice Water, Refrigerators, Freezers, And Even Car And Home Air Conditioning Environments. Reusable: Made Of Very Durable Material, It Keeps The Body Cool For 40-90 Minutes After Each Freeze, Rinses Well And Can Be Frozen Again For Repeated Use. Wide Range Of Applications: AAll Outdoor Sports: Hiking, Golf, Fishing, Driving, Fitness, Summer Camps, Etc. B Workers In Hot Weather: Cooks, Soldiers, Students, Field Workers, Gardeners, Farmers. C Relieves Hot Flashes Or Fever. It Even Works For Dog And Cat Pets! Safe and reliable: the materials we use are BPA-free. the cooling ring has been tested by SGS. Eco-friendly TPU material made in Korea, ergonomic, soft and skin-friendly with elasticity, thick neck can also be used. High frequency sticky and firm, will not break easily. [Natural crystallization below 28 degrees] Method: Put it in cold water, air conditioner port, refrigerator, etc., wear it on the neck after cooling, unisex, adjustable opening, carry it at any time, long-lasting ice