Arai Helmet Size Chart
Helmet Sizes by Head Circumference
Helmet Size
X-Small
Small
Medium
Large
X-Large
2X-Large
Centimeters
53-54
55-56
57-58
59-60
61-62
63-64
Comfort Lining Thickness
Helmet Size
X-Small
Small
Medium
Large
X-Large
2X-Large
Lining Code
Liner II (SM)
Liner II (SM)
Liner III (MD)
Liner III (MD)
Liner IV (LG)
Liner IV (LG)
12 mm Thick
Option
Option
Option
Option
Option
Option
10 mm Thick
Standard
Option
Standard
Option
Option
Option
7 mm Thick
Option
Standard
Option
Standard
Standard
Option
5 mm Thick
Option
Option
Option
Option
Option
Standard
Cheek Pad Thickness
Helmet Size
Optional
Optional
X-Small
Small
Medium
Large
X-Large
2X-Large
Optional
Optional
Shell Design
RX-7
40 mm
40 mm
35 mm
30 mm
30 mm
25 mm
25 mm
20 mm
15 mm
12 mm
Int. Oval
Quantum
40 mm
40 mm
35 mm
30 mm
30 mm
25 mm
25 mm
20 mm
15 mm
12 mm
Round Oval
Astral
-
-
35 mm
30 mm
30 mm
25 mm
25 mm
20 mm
15 mm
12 mm
Int. Oval
Profile
-
40 mm
35 mm
30 mm
30 mm
25 mm
25 mm
20 mm
15 mm
12 mm
Long Oval
VX-Pro
-
35 mm
30 mm
25 mm
25 mm
20 mm
20 mm
15 mm
12 mm
-
-
MXC-Pro
40 mm
-
35 mm
35 mm
35 mm
30 mm
30 mm
25 mm
20 mm
15 mm
-
XD
-
35 mm
30 mm
25 mm
25 mm
20 mm
20 mm
15 mm
12 mm
-
-
Ear Cup Thickness
Helmet Size
X-Small
Small
Medium
Large
X-Large
2X-Large
Optional
Classic/m - Classic/c
30 mm
25 mm
25 mm
20 mm
20 mm
15 mm
-
SZ/m - SZ/c
35 mm
30 mm
30 mm
25 mm
25 mm
20 mm
15 mm
SZRam III
35 mm
30 mm
30 mm
25 mm
25 mm
20 mm
15 mm