polypropylene; This tumbler ensures your liquid intake is measured accurately, helping you adhere to your doctorÕs recommendations and avoid potential health complications; Double-wall for extra insulation; Snap on lid with twist closure; not leak-proof; Comes with bendable straw and tethered straw cap; Measurements in ounces and millilitres; Product Size: 4.4″ w x 7.7″ h x 4″ dia.