The Puebco Borosilicate Glass Mug in Shallow Stacking is a heat-resistant glass mug designed for daily use. Borosilicate glass handles thermal shock better than standard glass — safe for hot drinks, cold drinks, and the transition between them. The shallow stacking design means it nests neatly with other mugs in the range.

Worth noting: rapid temperature changes (boiling water into a cold glass) can still cause cracking. Fill with hot water first to temper before adding your drink.