The 30 oz. Mammoth Rover tumbler features double-walled vacuum insulation, keeping ice for up to 36+ hours, and liquid hot 12+ hours with no condensation. The Rover tumbler is built with durable 18/8 kitchen grade stainless steel with a deluxe powder coating finish. Featuring a clear lid, rubber gasket and stopper so your beverage will maintain constant temperature longer. Fits most cup holders. Lifetime warranty.