Cool Ring, Extra Thick Ice Ring, Naturally Freezing, Long-Lasting Sustained Cooling for up to 120 Minutes Unusually thick. I am selling this because I purchased several. Used only once. There was a faint dot-like mark from the time of purchase. It's barely noticeable. Light Blue M Size U-shaped silicone neck cooler, perfect for heatstroke prevention. - Color: Light Blue - Design: U-shaped, fits the neck - Material: Silicone - Usage: Heatstroke prevention, cooling *Please refrain from purchasing if you are sensitive to such things. Thank you for viewing.