Specifications: Cool Ring, Neck Cooler, Ice Neck Ring, Cool, Ice Neck Band, Cooling Sensation, Can be Repeatedly, When Wearing Mask, Cooling, Protects Against Heat, Heatstroke, Cooling Goods, Indoor Work, Kitchen, Vinyl House, Sports Watching, Outdoors, Unisex, Pet Size: S: Inner Diameter: Approx. 3.0 inches (75 mm) / 2.95 inches (95 mm) / 3.74 inches (120 mm) / 4.0 inches (12 inches (12 mm) L: Inner Diameter: Approx. 72" Material: PVC Phase Change Cooling Material Package Contents: 1 * Cooling Neck Ring Note: 1. Inner diameter is about 5cm /1.97 inch difference is normal.2. Due to the lighting effect and shooting angle, there may be some color difference, please understand.3. Due to manual measurement, the size of the item will be acceptable.