Doshisha ON℃ZONE Vacuum Insulated Stainless Steel Beer Mug, 420ml, Freezing to Sub-Zero Temperatures, Black, OZFJ420JBK

This mug can chill any unchilled drink to below freezing. Its three-layer construction (a layer of ice pack material inside + a double-vacuum layer outside) keeps the ice cold for a long time. Simply place it in the freezer, pour in your drink, and wait 30 seconds for it to cool to below freezing. Adding 4°C water (the temperature of the water stored in the refrigerator) will cool your drink to below freezing in 30 seconds. Please note that leaving the drink in the mug will turn it into sorbet. Even if you want to chill beer, you can't add ice to it. This freezing mug is ideal for drinks that don't support ice (beer, cafe latte, juice, etc.). It's also ideal for highballs and chuhai.

Pour a drink into a mug frozen in the freezer and it will instantly drop below freezing.

The vacuum insulation keeps the drink cold.

The built-in refrigerant keeps it ice-cold.

Material: Stainless steel

Color: Black