Cool Ring, Extra Thick Ice Ring, Naturally Freezing, Long-Lasting Sustained Cooling for up to 120 Minutes Unusually thick. I'm selling this because I bought several. Used only once. L Size Clear Blue U-shaped silicone neck cooler, perfect for heatstroke prevention. - Design: U-shaped, fits the neck - Material: Silicone - Usage: Heatstroke prevention, cooling *Please refrain from purchasing if you are overly concerned about details. Thank you for viewing.