Easy to Use: uses new high-tech phase change materials to keep you stay cool in hot summer and has a faster and long-lasting effect than water. No Batteries Required: The Neck Wrap for Cooling needs no batteries for operation, Just put the Cooling Tube into ice water, and can be used in most air conditioners, freezers, etc. Pleasant Cooling Time: The Cooling Neck Ring will provide you with an enjoyable cooling time by maintaining an optimal cooling temperature without wetting your clothes or hair. Wide Range of Use: Suitable for most sports and outdoor activities, such as jogging, golfing, fishing, playing basketball, cycling, hiking, driving, gardening, etc. The Cooling Neck Wraps are suitable for those who love outdoor activities, such as fishing, hiking, jogging, camping, sports, etc., those who work in a hot environment, farm, fishery, forestry, those who wear suits, and those who are attending sports events, musical festivals, etc. Colour:Blue Material:TPU+PCM Package Contents: 1 * Cooling circle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.