FULLY COVERED, LEAKPROOF STRAW: The Era Flip series features our patented SlideSea!™ 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. Note the body of Peach Gingham is hand wash only, but the straw, lid and all of its components are top-rack 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.