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 FDA Requirements | BPA Free | Hand Wash Recommended