HELMET SIZING GUIDE
X-LARGE
FAST HELMET SIZE
CHINSTRAP SIZE
(in)
S/M
MEDIUM
M/L
L/XL
LARGE
27.5-30.5
26-29
24.5-27.5
CHINSTRAP SIZING GUIDE
Certain head shapes may require a smaller or larger chinstrap
than the one that comes with the helmet you selected. The sizing
guide is provided for reference. If you feel a different chinstrap
size is needed, contact Ops-Core customer service.
12
13
14
15
16
17
18
19
2 0
FAST HELMET SIZE
Head Circumference
(cm)
Head Circumference
(in)
Head Size
(US)
53 - 56
21 - 221⁄8
S/M
up to
7
56 - 59
221⁄8 - 233⁄8
M/L
up to
73⁄8
59 - 61
233⁄8 - 24
L/XL
up to
75⁄8
13
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
RUN MEASURING
TAPE ALONG FRONT
EDGE OF EAR
FAST helmets have been designed from the ground up to fit the largest group of users in helmet sizes that most
closely match their heads. However, there is still a small percentage of users that will not fit our standard sizing
configurations. Please use the sizing guide below to determine your helmet size and your chinstrap size.
SIZING GUIDE
6
