the Rambler 295 ML Lowball is the ideal Drinking companion. Easy to stack and store, the Lowball's Double-wall Vacuum insulation will keep your hot drinks how, and your cold drinks cold longer than standard drinkware. Enjoy your evening whiskey by the fire, and refill with coffee the next morning. Like the entire Rambler Drinkware Family, the Lowball and included Magslider Lid are dishwasher safe for easy cleaning. while the magnet slider adds an additional barrier of protection to keep drinks hot or cold, this manet slider is not Leakproof and will not prevent spills.