This portable vacuum insulated mug is made of food-grade stainless steel on both inside and outside walls. Double-walled vacuum insulation keeps drinks hot or cold for a long time. Basic black and white design gives us a very high-end feeling. The lid has a silicone ring that prevents moisture loss and achieves a watertight seal. You can enjoy a glass of red or white wine, or champagne, beer, cocktails, soda, juice or simply water. These tumblers have you covered so that you can use for entertaining as well as everyday drinking. It is perfect for school, work, travel and fitness. Custom logo is available.