SIZING GUIDE
HELMET SIZING GUIDE
X-LARGE
FAST HELMET SIZE
CHINSTRAP SIZE
(in)
S/M
MEDIUM
M/L
L/XL
LARGE
XXL
X-LARGE
27.5-30.5
27.5-30.5
26-29
24.5-27.5
CUSTOM FIT COMBINATIONS
Your FAST Helmet can be custom fit
with an alternate chinstrap size upon
ordering or a replacement chinstrap
can be purchased separately.
CHINSTRAP SIZING GUIDE
Since people have different shaped heads, helmet size (the size
of the top of your head) is not always proportional to the chinstrap
size (the size of your face).
12
13
14
15
16
17
18
19
2 0
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
S/M HELMET
WITH
LARGE CHINSTRAP
L/XL HELMET
WITH
MEDIUM CHINSTRAP
FAST HELMET SIZE
Head Circumference
(cm)
Head Circumference
(in)
Head Size
(US)
53 - 56
207⁄8 - 22
S/M
up to
7
56 - 59
22 - 23¼
M/L
up to
73⁄8
59 - 62
23¼ - 243⁄8
L/XL
up to
75⁄8
62 - 64.5
243⁄8 - 253⁄8
XXL
up to
81⁄8
5
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. If you require a non-standard chinstrap/helmet configuration,
custom solutions are available.