• A set of two shapely double-walled wine glasses. Made from chemistry-grade borosilicate glass the design insulates the glass keeping your beverages cold or hot longer. You ll love the pleasing optical effect of the liquid floating in air inside the glass. They are made from durable hand-blown glass and present far fewer defects if any 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.