This Persona Wave Trail Cadillac dual wall tumbler is made with stainless steel and a copper-lined deep draw liner. It is vacuum insulated, providing 9x the heat retention for all of your drinks. Comes with a leak-proof screw-on lid with visual open/close push button locking closure. The lip groove allows for drinking spout to be positioned without even looking. Holds 414mL/14 ounces.