Everyone looks twice : Is the beer upside down? the double-walled beer glasses only look like normal beer glasses at first glance. When you pour in the delicious, cool beer, the special thing about the design becomes apparent: the inner wall has the shape of an upside-down beer bottle!
This also eliminates the question,"Are you drinking from the glass or the bottle?" Both!
But the double-walled design has more than just visual advantages: The layer of air between the glass walls insulates. So every drink stays cool for an extra long time.
