The bold and colorful Stanley IceFlow Flip Straw Tumblers are made to keep you hydrated in a fully functional style. Ideal for commutes or workouts, it has a built-in flip straw for easy and effortless sipping. Snap it shut and the double-wall vacuum insulation will keep your drink fully leakproof and cold for 12 hours, iced for 48 hours. It fits comfortably in your car or bike cup holder of treadmills and spin cycles, too!