Zojirushi Stainless Steel Vacuum Mug is designed to drink directly out of the mug. Keeps your beverage hot or cold for as long as 6 hours. Lightweight, durable and economical. The flip-open lid has a safety lock that prevents the lid from opening accidentally. The SlickSteel finish interior resists corrosion and repels stains. Stopper disassembles for thorough cleaning. FeaturesZojirushi Stainless Steel Vacuum Mug is designed to drink directly out of the mug. Keeps your beverage hot or cold for as long as 6 hours. Lightweight, durable and economical. The flip-open lid has a safety lock that prevents the lid from opening accidentally. The SlickSteel finish interior resists corrosion and repels stains. Stopper disassembles for thorough cleaning.