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 mugs wide opening means contents are easily accessible, but will cool quicker. Thats 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 leakproof and will not prevent spills.