Neck Cooler Utilizes evaporative cooling, where heat is absorbed as water evaporates, providing a natural coolness that lasts for a long time, similar to wrapping a wet towel around your neck. Magikool, with over 8 million units sold cumulatively. Magikool Cools the neck - just soak in water Water retention lasts approximately 20 hours Size: Regular M Color: Light Blue Made in Japan New and unused. Can be used repeatedly. Please only purchase if you understand that this has been kept at home. Returns cannot be accepted. Immediate purchase OK No price reductions, please.