S'well Mugs feature Therma-S'well® Technology with triple-layered, vacuum-insulated construction, designed to keep beverages colder or hotter, longer than all the rest. Offers a condensation-free exterior that won't sweat in your hands or bag. BPA/BPS-free and reusable. Made from 18/8, food-grade stainless steel with superior construction to reduce the need for single-use cups. Top-rack, dishwasher safe.