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