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 18 Oz. With Lid On; Keeps Drinks Hot Or Cold Up To 6 Hours; Non-Slip Bottom; Meets FDA Requirements; BPA Free; Hand Wash Only