Whether your rides are short and sweet or epic adventures, Bontrager's Quantum WSD has got you covered. It features in-molded construction with internal reinforcements for top-notch safety. And you'll love the all the ventilation, even at low speeds. It comes in two different sizes, and when you combine that with the LockDown side straps and the Micro-Manager Fit System, you've got a custom fit that is tailor-made just for you. Plus, it sports washable fit pads and a removable, snap-on visor, too.