Our glass is created with very high manufacturing standards - we use longer curing times to ensure strength in the glass itself. So it is beautiful as well as durable. Treat them well and you will be able to pass these babies down!
Hand washing is best, also no hot liquids. But the freezer is ok! Our thicker tumblers and steins retain temperature very nicely so stick them in the freezer for a chilled beverage you wouldn't want to water down with ice.