The double-walled glasses from Bodum, made of flavor-neutral borosilicate glass, are lightweight yet robust. Beneath the glass bottom, there is a hydrophobic silicone membrane that serves to equalize pressure between the glass walls. It allows the glass to breathe: with cold beverages, no condensation forms on the surface of the glass, leaving no unsightly water rings. These glasses are also ideal for serving ice cream and other desserts.