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