Smith Persist MIPS Bicycle HelmetFast paced lunch ride or weekend 60 miler, the Smith Persist Road Helmet is down for whatever you've got in mind. Designed to feel like it's tailor made for your head, you can fine tune the fit on the fly with an easy to use dial adjuster. When you're sweating it out on the climb, 21 fixed vents and Smith's AirEvac ventilation system keep the air flowing, your head cool and your glasses from fogging. Energy absorbing zonal Koroyd complements Mips