Stainless Steel Outer and Inner, Double Wall Construction For Insulation Of Hot Or Cold Liquids, Vacuum Insulated, Screw On, Spill-Resistant Lid, Cork-Look Rubberized Base Protects Surfaces From Heat And Scratches, Keeps Drinks Cold Up To 24 Hours and Hot Up to 12 Hours, Meets F-D-A Requirements, BPA Free, Hand Wash Recommended