The Simple Modern Voyager Tumbler is double wall, vacuum insulated, and made with premium gauge 18/8 stainless steel keeping your beverage hot or cold for hours. It comes with our insulated flip lid which is perfect for the person on the go. This mug is perfect for the home, office, camp-site, and so much more. Simple Modern also gives at least 10% of profits to causes we believe will change the world.