The Ninja Hot & Cold 18 oz. Insulated Tumbler is specially designed for both your hot and iced coffee. The durable double-walled Tritan plastic design, with crystal-like clarity, keeps your iced coffee colder and hot coffee hotter and resists condensation. The measurement ribs you see on the inner wall of this cup are no average design ribs, they are 2oz. measuring marks that tie into the Ninja Coffee Bar Recipe Book for easy measuring of milk, syrups and other ingredients. Place the Double-Walled Ninja Hot & Cold 18 oz. Insulated Tumbler on the bottom plate of the Ninja Coffee Bar and brew directly into it for ultimate convenience. Includes a Sip & Straw Lid for drinking directly from the lid or from a straw. All Ninja Tritan plastic vessels are microwave and top-rack dishwasher safe.