The Polar Camel 20oz. Stainless Steel Polar Camel Travel Mugs feature double-wall, vacuum insulation. These travel mugs come with a slide lid to help prevent spills! They are 2X heat and cold resistant compared to other tumblers. Laser engraved leaving silver, stainless steel show-through imprint. This product is not recommended for dishwasher use. The perfect product to keep your drinks hot or cold while on the road. An optional magnetic or snap lid is available at an additional cost. Silicone straws may also be sold separately with these beautiful tumblers.