Avantro 14-Ounce Leakproof Commuter Mug, Cobalt Blue Metallic Leakproof lid elimates all spills, even on its side or upside down Simple one-handed operation: press the lever to drink and release to close the opening (right -or left handed). Vacuum insulated with exceptioonal temperature retention: hot for over 3 hours or cold for over 6 hours