Stainless Steel Outer And Inner. Powder Coated Finish. Double Wall Construction For Insulation Of Hot Or Cold Liquids. Vacuum Insulated. Snap-On, Spill-Resistant Flip Top Lid with Straw Hole and Matching 9 1/2" Straw. Non-Slip Bottom. Meets F-D-A Requirements. BPA Free. Hand Wash Recommended.