Bullet Points:1, Long-lasting Cooling Tube: Get ready for a hot summer and innovative materials developed to keep you cool. This gel freezes faster than water and lasts longer!2, No batteries required: no charger required! Simply insert this neck cooling tube into ice water. Is there no ice around you? Do not worry! It can be frozen with any air conditioner! Car air conditioners, office air conditioners, household air conditioners, ice bins, refrigerators and freezers.3, Safe and fun: enjoy a cooling time of 4-6 hours indoors and 3-5 hours outdoors. Cooling time depends on the external environment. By maintaining an optimal cooling temperature, the new material has no risk of skin necrosis or frostbite.4, New Coolant: Brand new coolant, no condensation! (Dry and cool)5, Physical cooling: Physical cooling, safer and safer. Features: Characteristics of cold sealing ring: the liquid inside is mainly imported liquid. The product can be used directly in contact with the skin after freezing in the refrigerator. The surface will not be hazy or a drop of water, and the temperature is always kept at about 18 degrees, which is very comfortable to wear! If plain water is put in the refrigerator and then taken out, it cannot be used directly in contact with the skin and it will be very cold! Our cold seal ring is made of a special liquid that is very