Doshisha ON℃ZONE OZFJ-420MT Freezing Tumbler, 420ml, Cools to Sub-Zero, Insulates, and Features a Mat

Size: W125 x D89 x H150 (including handle) Diameter: 89mm Structure: This stainless steel mug features a three-layer vacuum cooling structure (ice pack layer + double vacuum insulation layer) that can rapidly chill drinks to below freezing. Cooling: Simply pour your drink into the freezer-chilled mug and the temperature will drop rapidly. Even room-temperature drinks can be made ice-cold by using a freezer-chilled mug! How to Use: If you pour a drink straight from the refrigerator into the freezer-chilled mug, it will cool to below freezing in as little as 60 seconds and keep it that cold. Caution: The cooling effect is so strong that if you leave a drink in it, it will turn into sorbet.