The YETI Rambler® 20oz Tumbler with MagSlider™ Lid is made from double walled vacuum sealed kitchen grade 18/8 stainless steel. It will keep your beverages frosty cold or piping hot for longer. The Rambler® will keep ice 2X longer than plastic tumblers and is designed for maximum ice retention. It's layered with an oleophobic coating, to make it fingerprint proof and it has been tested to the highest level of UV resistance as well as being dishwasher safe. The MagSlider™ lid slides easily back and forth to protect from splashes and helps to minimize accidental spills. The YETI Rambler® 20oz Tumbler will be your go to beverage holder for years to come.