Contoured 350ml double wall travel mug which will keep drinks hot for longer. It has a stainless steel outer wall and a polypropylene inner wall. Aspen has a secure screw on lid with a splashproof sliding closure. It laser engraves to a natural etch and is BPA-free. This product is not dishwasher safe and handwashing is recommended.Features:* BPA-free 350ml double wall travel mug* Manufactured from a stainless steel outer and polypropylene inner* Features a secure screw on lid with splashproof sliding closure