Clean and durable, made of pure 304/18-8 stainless steel, this vacuum insulated double-walled Tumbler keeps hot and cold beverage temperatures steady without burning hands or forming condensation. Ergonomic shape is comfortable in-hand and is car cupholder-friendly while convenient sip-top keeps bugs out and helps prevent sloshing. Durable 304, 18/8 stainless steel for a lifetime of reliable use. Vacuum insulation keeps your beverage at the optimum temperature.