The Umbria double wall tumbler has stainless steel outer wall and polypropylene inner wall. Its double wall construction keeps drinks hot or cold for longer and protects your hands from extreme temperatures. The clear lid with sliding closure protects your drink between sips and the base pad keeps it from slipping on your table top. The perfect mug for home, office or take it on a car trip as it fits most standard car cup holder. FDA compliant and BPA Free.