Stainless Steel Outer And Inner . Double Wall Construction For Insulation Of Hot Or Cold Liquids . Vacuum Insulated . Capacity Is 22 Oz. With Lid On. Snap-On, Spill-Resistant Flip Top Lid with Straw Hole and Matching 9 1/2" Straw. Non-Slip Bottom . Meets FDA Requirements . BPA Free . Hand Wash Recommended.