SK12 Ice Cool Ring 3-Layer Tube Structure, Size M, Fluorescent Type Color: Pink (Fluorescent Type) Size: M Material: Outer Layer: TPU Middle Layer: PCM [How to Use] ① Place in cold water/freezer ② After freezing, put it around your neck [Features] Fluorescent type for safe nighttime outings. Three-layer tube structure. Cooling lasts for approximately 18°C. Antibacterial material. No condensation. No risk of frostbite. Brand new, unused. Thank you. #NeckCooler