FULLY COVERED, LEAKPROOF STRAW: The Era Flip series features our patented SlideSeal technology, delivering a 100% leakproof seal while keeping your straw completely shielded from the elements. Simply slide to open or close. Works with both cold and carbonated drinks - just make sure to use at least 50% ice with carbonated beverages. COLDKEY METAL STRAW: The Era Flip series also has our ColdKey stainless steel straw so you can reduce the amount of plastic sitting in your water all day and experience a cool, crisp drinking experience with a soft-touch silicone tip on the outside to top it off. EASY TO CLEAN: The Era Flip was designed with hygiene in mind. Aside from having a completely covered straw, every component of the Era Flip lid is fully removable, allowing you to quickly disassemble and deep-clean every single part. Most finishes are dishwasher safe. 24+ HOURS COLD: Thanks to our BevGuard insulation, the Era Flip will keep your favorite drinks ice-cold for 24+ hours. CUP-HOLDER FRIENDLY BASE: The Era Flip has a sleek, tapered design that fits all standard cup holders. Era Flip is totally leakproof, and made for stress free sips on the go. It has our patented and fully leakproof SlideSeal lid that completely covers your straw and works for both cold and carbonated beverages, ColdKey metal straw for minimizing the amount of plastic sitting in your water, SoftSip silicone straw so every sip feels like a luxury, BevGuard technology to keep ice for 24+ hours, and a cup-holder friendly base so you can enjoy your favorite beverage, free of leaks and spills throughout your daily journey.