Never worry about a broken glass again! Crafted from copolyester and durable as the day is long. Rest easy with tough, shatterproof drinkware that looks like fancy glass. Dishwasher safe and BPA-free. Dishwasher safe. Heat-resistant but not recommended for use in the microwave. Straight, high-proof alcohol is not recommended as it can cause damage if left in a glass over a long period of time. Dry with a soft, non-abrasive, lint-free cloth.