Flow 350 ml foam insulated tumbler. The flow tumbler is a double wall foam insulated tumbler. It is equipped with a single-hand, screw-on push button lid with a non leaking function to make sure your drink stays put. The silicone pad on the bottom makes the tumbler skid-proof. Volume is 350ml. Red Dot winner 2014 and IF Award Winner 2014. Presented in a gift box. Exclusive design. Stainless steel, Plastic.