Flow non leaking insulating tumblerthe flow tumbler is a double walled 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 350 ml red dot winner 2014 and if award winner 2014 presented in a gift box exclusive designstainless steel exterior plastic interior