Features: - The 360 lid is leak-proof and couldn't be easier to use: Press the middle button, drink from any side, and press again to close it. It is made from BPA-free plastic with a seal. - The double-walled Thermo 3D vacuum insulation technology keeps your drink at the desired temperature – hot or cold. - The walls are made of medical-grade 18/8 stainless steel. The outer wall is coated with a hard-shell powder finish. The material does not transfer any flavor and does not add a metallic aftertaste. - Hand washing is recommended, but the cup is dishwasher safe on the top rack. - Each product is marked with a code on the bottom. You can register the code and track the environmental project you supported with your purchase! - Packaged in a box.