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 Recommended