This 30 oz. Polar Camel Tumbler is designed with double-wall vacuum insulation and a clear lid. Its narrow bottom makes it compatible with most standard cup holders. With a 2X increase in heat and cold resistance compared to traditional tumblers, it is ideal for on-the-go use. Made from 18/8 gauge stainless steel (18% chromium/8% nickel), also known as Type 304 Food Grade, this tumbler is both durable and safe for food consumption.