An elegant set of two double-walled silicone base highball glasses. Made from chemistry-grade borosilicate glass, the double-walled design insulates the glass, keeping your beverages cold or hot longer. You'll love the pleasing optical effect of the liquid floating in the air inside the glass. They are made from durable hand-blown glass and present fewer defects compared to other glasses. And they are backed by a lifetime warranty, so you'll receive high-quality mugs you'll enjoy for years to come.