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 tight fitting flip-open lid has a safety lock that prevents the lid from opening accidentally. The nonstick interior is easy to clean. Stopper disassembles for easy 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 tight fitting flip-open lid has a safety lock that prevents the lid from opening accidentally. The nonstick interior is easy to clean. Stopper disassembles for easy cleaning.