So comfortable you won't ever want to take it off. The A3 mountain bike helmet is a new standard in premium mountain bike helmets with luxurious comfort, patent-pending innovations in safety, ventilation that will you keep you cool on the longest climbs with comfort and coverage to protect on the sketchiest of descents. Highest possible score (5-STAR) from Virginia Tech helmet safety lab so you can feel confident in all conditions.
|HAT SIZE||6 5/8 - 7||7 1/8 - 7 3/8||7 1/2 - 7 7/8|
|CM||53 - 56||57 - 59||60 - 63|
|INCHES||20 7/8 - 22||22 3/8 - 23 1/4||23 5/8 - 24 3/4|
Measuring your head with a fabric tape measure around the circumference of your head holding the tape just above your eyebrows and ears. 1" = 25mm