This 30 oz Big Joe Tumbler features a double wall design made of 18/8 stainless steel and lined with copper for ultimate insulation. Its vacuum insulation can keep your beverages hot for up to 8 hours and cold for up to 16 hours. The acrylic screw on sip lid provides a secure seal, while the tumbler itself is top rack dishwasher safe for easy cleaning. Please note that all Elevation and Fresco imprint methods should be handwashed.