Bodum Bistro Double-Wall Insulated Glass Caf&eacute; Latte Mug (Set of 4 Mugs) Set of 4 double-wall glass mugs with 15-ounce capacities--great for lattes Mouth-blown, lab-quality borosilicate-glass construction; durable and heat resistant 2-layer design creates dramatic optical illusion and prevents condensation Safe for dishwasher and microwave use; not for use with metal utensils Winner of prestigious European IF Design Award; 1-year limited warranty