Whether you are outdoors in the summer sun or sheltering inside from winter weather, the Slumberjack 30oz tumbler is the perfect container for any drink. Made from stainless steel and built with a vacuum insulated double wall, this tumbler will keep liquids cool for up to 20 hours and warm for up to 4 hours. This Slumberjack Tumbler is BPA free and designed to be dishwasher safe. The Slumberjack tumbler you can bring comfort wherever your adventures may take you.