OK, so you want to know what's so special about Double Walled Glasses? First, they're tempered glass; second, they don't "sweat" when you have an icy beverage inside. There's air in between the layers of glass so you'll never need a coaster. Nor will your guests. Pretty neat.
These were from the Luzia show performed by Cirque du Soleil and were probably $25-30. And yes, they're brand new, in the original box.