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. Offers a condensation-free exterior that won’t sweat in your hands or on the table. 18oz = 3.46"D x 3.35"W x 6.26"H, 0.45lbs - .5 Liters. High-Grade 18/8 Stainless Steel. BPA/BPS-free and reusable. Triple-layered for maximum insulation, leaving no condensation on the exterior.