Keep Drinks even Colder/Hotter: Even the regular lids will keep drinks cold or hot for MANY hours. However, the slide lock enclosure will add even more time to that.
Greatly Reduce Spills: While the slider lid isn't 100% spill-proof, it will greatly reduce the amount spilled while closed.
Premium Sipping Experience: The curvature of the slider lid provides a premium sipping experience. You can even put your pinky up!
