Kaz Koffee Tumblers are double walled vacuum insulated and will keep your coffee hot for approx. 4 hours and protein shakes cold for approx. 8 hours. The Kaz Koffee Tumblers are BPA Free and include a plastic lid with spill prevention slide lock. It’s perfect for showing off your “Conceive, Believe, Achieve” mentality on the road, at the office, or at the gym.