The Rambler® 14 oz mug is one of the toughest, most over-engineered camp mugs out there. Unlike traditional camp mugs, this double-wall vacuum-insulated body protects hands from hot or cold contents while keeping coffee, chili, oatmeal you name it well-insulated. Like all Rambler® drinkware, the 14 oz mug and lid are dishwasher safe making them easy-to-clean. The mug's wide opening means contents are easily accessible, but will cool quicker. That's why the mug comes with the MagSlider™ lid, it adds an additional barrier of protection to prevent heat or cold from escaping, but please note the magnet component is not leak-proof and will not prevent spills.