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CMS Helmet Sizing Chart
To measure your correct helmet size, measure the circumference of your head, like a headband, about 1 inch (2.5 cm) above your eyebrows and just above your ears. Match your centimeter measurement to the chart below. If you happen to be between sizes, choose the next larger size. Your helmet should fit snugly on your head similar to a cap, but be fairly firm on the cheeks as they will bed in after a short amount of time. Take three measurements to be sure.
No sizing chart can compare with trying on a helmet for the proper fit. Call us for any questions.
Important Sizing Note!
Full-Face Helmets: If you base your size on other helmets, our customers have found that the CMS sizes run about one size smaller. So, if you wear an L in most other brands, order an XL in CMS for the best fit.
Open Face J3 Helmet: This helmet runs one size large. Order one size smaller with this model. | 
