Measuring your head is the starting
point for the sizing procedure. Due to varying shapes, heads that are
apparently the same size when measured by a tape may not necessarily fit
the same size helmet. You are trying to find the longest distance around
your head, at eyebrow level, above the ears. It may require several
different attempts to establish the longest possible measurment, but it
is absolutely essential to getting the right fit.
NOTE: Be sure
to use an accurate measuring device that shows inches (in.) and
centimeters (cm.). They are obtainable at any fabric store near you.