The circumference of the head should be measured at a point approximately one inch above the eyebrows in front, and at a point in the back of the head that results in the largest possible measurement.
- Open helmet to its largest setting and position on the head so that the front edge of the helmet is one finger width above the eyebrows
- Slide the front and back portions of the helmet together until a comfortable snug fit is achieved
- Tighten the adjustment mechanism
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