A New Era Of Straw Tumbler Is Here. Our Era Tumbler Is Totally Leakproof, And Made For Stress Free Sips On The Go. It Has Our Fully Leakproof Ü-turn™ Lid That Works For Both Cold And Carbonated Beverages, Coldkey™ Metal Straw For Minimizing The Amount Of Plastic Sitting In Your Water, Bevguard™ Technology To Keep Ice For 24 Hours, And A Cup-holder Friendly Base So You Can Enjoy 30oz Of Your Favorite Beverage, Free Of Leaks And Spills Throughout Your Daily Journey.