The Bodum Pavina 250mL Double Wall Glasses are handmade by expert artisans, using mouth-blown techniques. The double-wall insulation technology will help to keep hot drinks warmer and cold drinks cooler, while keeping the outer surface constant in temperature and comfortable to hold without condensation. Tip: Place the ice cubes after placing the liquid first inside the glass. Also avoid using metal spoons or placing the glass into a crowded dishwasher. Try to hand-wash where possible to ensure your double-wall glasses last longer.