Brite Americano Grand Thermal Mug, designed with the Milly’s Smiles logo, is double-walled insulated made from polypropyline. These modern-styled cups are BPA free with a screw lid that fixes securely, making an ideal product for keeping drinks warm on-the-go. Important: This product heats up when filled with hot liquid and is recommended to be held by the handle only. Not spill or leak proof. Mug and lid are top-rack .