Keep the cold cold, and the hot hot. YETI 20 oz. Rambler® Tumbler travel cups are the ultimate drinking vessel at home, on the boat, or pretty much wherever you go. Constructed from durable kitchen-grade stainless steel for exceptional durability. A double-walled vacuum design keeps your coffee hot, and your iced drinks cold for twice as long as conventional plastic tumblers. 18/8 stainless steel. A clear, shatterproof BPA lid lets you see when you need a refill. Washable. Imported.