Polypropylene Material , Double Wall Construction For Insulation Of Hot Or Cold Liquids, Snap-On, Spill-Resistant Flip-Top Lid, 9" Flexi Straw Included, Two Lid Openings, One With Straw And One With Sip Through Hole, Measurement Scale In Ounces And Milliliters Makes Tracking Liquid Intake Easy , Meets F-D-A Requirements , BPA Free , Hand Wash Recommended