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.