The Magisso Cool-ID Self-Cooling Glasses stay cool despite the heat. Just soak the ceramic glass for a minute, or run it under the tap, and the patented cooling effect kicks in. The cooling effect keeps the glass up to 40% cooler than the ambient temperature for hours, and the ceramic exterior can be labeled or personalized with chalk to differentiate between drinks at gatherings. The modern shape and new technology is matched by the quality of old-world craftsmanship for a truly timeless set.