A silicone vent at the base of each double-walled latte mug equalizes the air pressure between the two layers of glass when either hot or cold liquid is added. Permeable only to air, never water, the vent enhances durability and will never allow liquids to enter between the two layers.
Obsessed. I want 10 more, perfect cappuccino or tea cup,. It’s large, it’s beautifully made, its sooo comfortable to drink the double glass makes it so your super hot beverage doesn’t heat up the cup. Love love love, top quality.. Deanna. New York, NY. Mon Dec 05 2022