The Montee double wall tumbler has stainless steel outer wall and polypropylene inner wall. Its double wall construction protects your hands from extreme temperatures and slippery condensation, and the durable powder coating finish helps guard against scratches. The clear lid with sliding closure protects your drink between sips and the base pad keeps it from slipping on tabletops. The perfect mug for home, office or car trips, it will fit most standard car cup holders. FDA compliant and BPA Free.