BRAND NEW, NEVER USED. Therma-S’well® Technology with triple-layered, vacuum-insulated construction designed to keep beverages colder or hotter, longer than all the rest. 18/8, food-grade stainless steel. Condensation-free exterior that won't sweat in your hands or bag. BPA/BPS-free and reusable. Hand-wash only. Therma-S'well® Technology keeps drinks hot or cold for hours