Stainless Steel Outer And Inner. Double Wall Construction For Insulation Of Hot Or Cold Liquids. Snap-On, Spill-Resistant Thumb-Slide Lid With Rubber Gasket . Due To Vacuum Insulation Technology, Capacity Is 30 Oz. With Lid On. Keeps beverages hot for up to 6 hours and cold for up to 12 hours. Non-Slip Bottom . Meets FDA Requirements. BPA Free. Hand Wash Recommended. The price includes shipping cost.