S'well Mug 12oz in Black. S'well Mug 12oz in Black. Embodying translucent hues in the purest form, the Stone Collection emulates the most coveted semi-precious gems. Featured in a durable stone-like texture for added grip, the muted color palette simulates the raw delicacy of the minerals. S'well Tumblers and Mugs feature Therma-S'well Technology with triple-layered, vacuum-insulated construction, designed to keep beverages colder or hotter, longer than all the rest.. BPA/BPS-free, reusable, and sustainable. Made from 18/8, food-grade stainless steel with superior construction. Wide mouth and thin rim for easy drinking. 12 oz/ 355mL. Condensation free. Top-rack, dishwasher safe. Ideal for at-home or on-the-go drinking. SWER-WA70. 14412-A21-73901. At S'well, they're a design company for good, best known for creating the first, reusable fashion hydration accessory. Founded by Sarah Kauss in 2010 to help rid the world of single-use plastic bottles, they believe something as simple as buying a beautiful reusable bottle or bowl can make a big difference. Whether it's their original, iconic 17-ounce bottle or their latest innovations in food, barware and accessories, everything they make is designed to perform and offer more ways to help you use less.