Superior performance, a sleek silhouette and an extensive collection of beautiful designs sets S'well apart. Our signature Therma-S’well® Technology is designed to keep beverages cold for 48 hours or hot for 24 hours. Therma-S’well® Technology with triple-layered, vacuum-insulated construction designed to keep drinks colder or hotter for longer. Holds plenty of water for a workout, or an entire bottle of wine. Bottle mouth fits most ice cubes. 18/8, food-grade stainless steel. Condensation-free exterior won't sweat in your hands or bag. BPA/BPS-free and reusable. Top-rack dishwasher safe or hand wash with warm soapy water.