Description:A functional, stylish and eco-friendly cooling artifact for the neck in high-temperature environments. A range of professional cooling products developed using new high-tech phase-change materials. It freezes below about 22 degrees. Melting slowly above 22 degrees. The product can be protected from the environment below 22 degrees, such as refrigerator, chilled water, air conditioner, wait about 30 minutes, the product freezes slowly, can be usedThe cooling neck band placed around the neck cools the neck and shoulder as it cools the blood flow. Store in the freezer for at least 20-30 minutes or simply soak in ice water for 10-20 minutesSpecification:Size:S: inner diameter about 75mm/2.95inchM: inner diameter about 95mm/3.74inL: inner diameter about 120mm/4.72inchMaterial: pvc phase change cooling materialPackage Included:1 x Cooling Seal Ring