Bullet Points: 1Fashionable and Eco-friendly: This product is a functional, stylish, and environmental protective cooling artifact for the neck in high-temperature environments. A row of professional cooling products developed by using new high-tech phase change materials. It freezes below about 22 degrees. Melting slowly above 22 degrees. 2Safe and Comfortable: Keep it at a comfortable temperature for the human body without causing ice burns. About 2-3 hours of cooling experience. Compared with water, it activates faster and has a lighter weight. 3Adopting High-strength Package: It will not break, suitable for children, adults, etc. Use it in hot summer. 4The product can be protected from the environment below 22 degrees, such as refrigerator, ice water, air conditioner, wait for a period of about 30 minutes, the product will freeze slowly, you can use it 5The Best Gift: This is the best gift for family and friends Specifications: Size: S: inner diameter about 75 mm/2.95 inches M: inner diameter about 95 mm/3.74 inches L: inner diameter about 120 mm/4.72 inches Material: PVC phase change cooling material Packing List: 1 * Cooling Neck Ring