DURABLY CONSTRUCTED PREMIUM MUG- The double-wall stainless steel design keeps your drinks hot or cold without sweating or burning your hands. LEAK-PROOF LID- The screw-on lid is leak-proof, so you don't have to worry about your beverage leaking. The flip-top lid securely fastens closed while not drinking and easily opens with one hand when you're ready to drink. EASY TO CLEAN- The lid of the mug is dishwasher safe for easy cleaning. The wide opening of the mug makes it easy to clean with most sponges and brushes. PREMIUM MATERIAL: Double wall vacuum insulated perfection in a stemless wine tumbler made from lifelong Stainless Steel! Keep your water, wine, or cocktail icy-cold for 9 hours or your coffee and tea scalding-hot for over 3 hours.