Viva H2O doubly insulated water bottles/ sippers are made of high quality food grade 18/8 stainless steel. The bottles are BPA free and odourless. Unlike plastic water bottles or single wall stainless bottles, H2O will keep your beverage of choice at your preferred temperature for hours, whether you choose hot, cold or room temperature liquids. All H2O products feature a lifetime warranty and are double wall vacuum insulated. They keep lemonade cold in the summer and coffee hot in the winter, theyre lighter and more durable than glass, and theyre free of the chemicals found in some plastics. These bottles use a double-wall vacuum design which creates an insulated buffer between the internal compartment and the external environment. This small barrier greatly help the liquids maintain a desired temperature. They are designed to be lightweight, making them great for long hikes, days on the beach, golf, long road trips or everyday meet-ups and long work hours. Moreover, when filled with ice, the exterior of your H2O will never leave a puddle on your desk or a drip on your shirt, or bag.