Polypropylene Material. Double Wall Construction For Insulation Of Hot Or Cold Liquids. Snap-On, Spill-Resistant Flip-Top Lid. 9" Flexi Straw With Tethered Cap 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 FDA Requirements. BPA Free. Hand Wash Recommended.