The HYDROBREW 400ml black double wall insulated tumbler is designed for those who value style, durability, and reliable performance in their hydration gear. Built from premium food‑grade stainless steel, it is completely free from BPA and harmful chemicals, ensuring that every sip is pure and safe. The advanced vacuum insulation technology maintains your drink’s temperature for extended periods—keeping beverages hot for hours or refreshingly cold without causing any condensation on the outside. Its sleek matte black finish offers a modern and professional look, making it suitable for work, gym, travel, or leisure. The leak‑proof, silicone‑lined lid prevents spills, while the wide mouth opening allows for easy cleaning and the addition of ice cubes. Lightweight yet sturdy, this tumbler is reusable, making it an eco‑friendly alternative to disposable bottles and cups. double wall insulated, black water bottle, 400ml stainless steel, leakproof lid, vacuum insulation, bpa free, condensation free, easy to clean, eco friendly, thermal tumbler, lightweight bottle, durable design, hot drink bottle, cold drink bottle, reusable water bottle, spill proof, travel bottle, everyday hydration, sleek design, premium bottle