Etna coffee and tea mug is a 100% leak-proof mug with a 3-in-1 lid system, which allows you to drink the way you like it without wasting a single drop. The mug is easy to take on the go, so you will enjoy your hot drinks wherever you are, perfectly as they should be. Etna grip mug will keep your drink hot for 9 hours and cold for 18 hours.