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. The Tumbler with Slide-Open Lid features a wide mouth and thin rim for easy drinking. Ice cubes fit effortlessly inside. The lid makes it ideal for use at home or on the go.