S'well Tumblers feature a Slide-Open Lid and Therma-S'well® Technology with triple-layered, vacuum-insulated construction, designed to keep beverages colder or hotter, longer than all the rest. The pop-on, Slide-Open Lid creates a splash-proof experience. Made from 18/8, food-grade stainless steel. Offers a condensation-free exterior that won’t sweat in your hands or on the table. The 18oz Tumbler holds your favorite beer or glass of iced tea. Keeps beverages cold for 12 hours and hot for 4. PA/BPS-free and reusable. Top-rack, dishwasher safe.