Combining the classic look and feel of ceramic with the durability YETI is known for, DuraSip™ Ceramic Lining is fused to 18/8 vacuum insulated stainless steel, making it tough enough to take tumbles and keep on sipping. It features a nonstick, no mess interior that resists staining from highly acidic beverages like coffee, and like all YETI™ Rambler® Drinkware — it’s dishwasher safe.