Brand new, unused (unopened). Feel free to ask questions *ᴗˬᴗ)⁾⁾⁾ This item uses natural PCM material that melts below 28°C. It can be used repeatedly, making it a great item for hot summers. It can be worn to fit head sizes from small children to large adults, so it's suitable for all ages! With an aluminum sheet, the cooling duration lasts 1.5 times longer! *Based on our research *Please be aware of similar products. This product is design registered and cannot be manufactured by anyone other than our company. If you see similar products, please let us know. Approximately 55 grams, ultra-lightweight! 18cm in diameter #HeatstrokePrevention #NeckCooler #CoolingPack