Smart 300ml double wall tumbler which will keep drinks hot for longer. It has a decorative patterned stainless steel outer wall and a polypropylene inner wall. Mosa has a secure screw on lid with a flip closure which has a soft rubber seal. The tumbler is BPA-free, laser engraves to a natural etch and is is beautifully presented in an XD gift box. This product is not dishwasher safe and handwashing is recommended.