Size Guide - Giro - Eclipse Pro
Giro Helmet Size Guide - Eclipse Pro
| International | S | M | L |
| Head Circumference | 20.07" - 21.65" / 51 - 55cm |
21.65" - 23.22" / 55-59cm |
23.22" - 24.8" / 59-63cm |
How to measure my size?
Helmet sizes are based on head circumference. Measure your size by wrapping a measuring tape snugly around the widest possible circumference - from the most prominent part of the forehead (often 1-2 fingers above the eyebrow) around to the widest part of the back of your head. Measure 3 times, and take the largest number. Using the chart above, select your size.