The Session Adult Bicycle Helmet by is a mountain-style hardshell helmet that provides maximum durability for mountain bike riders who are ready to rip, while the full shell coverage and extended length visor conveniently offer enhanced protection. It's that durable microshell design that makes this helmet perfect on the trail, in the street and everywhere in between. Of course, the kicker with helmets is nobody wants to wear one if it isn't comfortable, right? That's why the adjustable dial fit offers 360˚ adjustability for the perfect custom fit, and 17 carefully placed vents provide maximum ventilation to keep heads cool and comfy. As always, all Mongoose helmets are CPSC approved.