Unlike traditional camp mugs, this double-wall, vacuum-insulated body protects hands from hot or cold contents while keeping coffee, chili, or oatmeal nice and hot. The mug and lid are dishwasher safe. Please note: The mug's wide opening means contents may cool quicker. That's why the mug comes with the MagSlider™M Lid. Please note: Do not place mug over external heat source or open flame. Vacuum seal or other damage may occur. This magnet slider is not leakproof and will not prevent spills.