Great for both hot and cold beverages, this double walled tumbler keeps cold drinks cool for more than 6 hours and hot drinks for 4 hours. Enjoy your drink with this BPA-free vacuum insulated tumbler featuring additional copper plating for extra temperature retention.It is dishwasher safe. Our product is stainless steel, rust proof which makes it strong. It has durable powder coating, no sweat design which fits cup holder air-gap vacuum layer.