Stainless Steel Outer And Plastic Inner Liner | Snap-On, Spill-Resistant Thumb-Slide Lid | Double Wall Construction For Insulation Of Hot Or Cold Liquids | Cork-Look Rubberized Base Protects Surfaces From Heat And Scratches | Due To Vacuum Insulation Technology, Capacity Is 18 Oz. With Lid On | Meets FDA Requirements | BPA Free | Hand Wash Recommended