Cold Ring Cold Neck Long-lasting Ice Neck Collar Outdoor Cool Artifact Hanging Neck Ring 100ml Features: Cool pillows and ice packs prepare you for the hot summer and keep you cool. This material freezes faster and lasts longer than water! (It takes 10 minutes in ice water and 20 minutes in a refrigerator or conditioner!) No battery required! No charger required! Any place below 18 C (64 F) will start freezing. Just put this neck tube into ice water. Enjoy a of 40 minutes to 2 hours. The cold insulation time varies depending on the external environment. By maintaining the optimal temperature for , there is no risk of skin necrosis or frostbite. new coolant, no condensation! TPU fabric with strong sewing ability! Headache and hot flashes - can truly headaches or hot flashes. Put it in the or directly on the . Product Product Package included: 1 x Cold Collar 1. Please put this product into the refrigerator to cool for 10-30 minutes before use; 2. the product freezes, take it out and use it directly; 3. It can be stored in the environment or water below 26C, the product will automatically, and the freezing time will depending on the temperature difference. Note: Please allow some difference due to manual measurement.