Homvare Glass Coffee Mug, Tea Cup for Office and Home Suitable for Both Hot and Cold Beverage

How to longevity: Safe in microwave, freezer, and dishwasher. To preserve the longevity of the glass, we recommend washing by hand to avoid the strongly water of dishwasher destroy the silicone vent. No burning and insulation: Double wall design prevent from burning hand, remains cool to touch, and keep the beverage hotter and colder..