1-3. Differences Between Models.
The head measurements listed below are rule-of-thumb measurements.
a. The helmet assembly accommodates three sizes of TPLs: small/regular, regular, and X-large (extra-large).
b. The helmet shell and energy-absorbing liner are available in the regular and X-large sizes. The regular size fits
head circumference from 21.5 inches to 22.4 inches; the X-large size fits head circumferences greater that 22.4 inches.
c. Head circumferences of less than 21.5 inches require the smaller/regular size TPL, with a regular-size energy-
absorbing liner installed in a regular-size helmet shell.
d. Nutplates mounted on the inside of the shell, to prevent posts from spinning/turning, is optional. Ensure you know if
your helmet is equipped with nutplates.
1-4. Equipment Data.
Regular - 50 ounces
X-Large - 52 ounces