Arai Sizing Info
Helmet Size & Lining Code Chart
| Helmet Size |
Circumference (CM) |
Lining Code |
| XS |
53-54 |
I |
| SMALL |
55-56 |
II |
| MEDIUM |
57-58 |
III |
| LARGE |
59-60 |
III |
| XL |
61-62 |
IV |
| XXL |
63-64 |
V |
| XXXL |
65-66 |
V |
INTERIOR LINERS AND CHEEK PADS
Many Arai models feature removable cheek pads that have a 5mm peel off slice and removable head liners with a 5mm peel off slice on the temple pads. You can remove these to micro-fit if necessary without having to buy additional pads. Often this allows you to stay in your fitted size rather than the traditional solution of moving up a size, which decreases comfort and performance while increasing noise and movement. You can also order optional thicker or thinner head-liners and cheek pads allowing you to even further custom fit your Arai helmet. To order a liner of a different thickness, start with the Lining Code that matches your helmet size, then specify the desired thickness. For example, an optional 5mm liner for a large helmet would be specified as III-5mm liner. All thicknesses of cheek pads will fit in all helmet sizes in their respective models.
Interior Lining Thicknesses Chart w/ Optional Size
Standard Optional
Signet-X / Quantum-X / Contour-X / Regent-X
| Size |
12mm |
10mm |
7mm |
5mm |
| XS |
|
|
|
|
| S |
|
|
|
|
| M |
|
|
|
|
| L |
|
|
|
|
| XL |
|
|
|
|
| XXL |
|
|
|
|
| XXXL |
|
|
|
|
Corsair-X RC
| Size |
12mm |
10mm |
7mm |
5mm |
| XS |
|
|
|
|
| S |
|
|
|
|
| M |
|
|
|
|
| L |
|
|
|
|
| XL |
|
|
|
|
| XXL |
|
|
|
|
| XXXL |
|
|
|
|
Corsair-X
| Size |
12mm |
10mm |
7mm |
5mm |
| XS |
|
|
|
|
| S |
|
|
|
|
| M |
|
|
|
|
| L |
|
|
|
|
| XL |
|
|
|
|
| XXL |
|
|
|
|
| XXXL |
|
|
|
|
VX-PRO4
| Size |
12mm |
10mm |
7mm |
5mm |
| XS |
|
|
|
|
| S |
|
|
|
|
| M |
|
|
|
|
| L |
|
|
|
|
| XL |
|
|
|
|
| XXL |
|
|
|
|
| XXXL |
|
|
|
|
RAM-X
| Size |
12mm |
10mm |
7mm |
5mm |
| XS |
|
|
|
|
| S |
|
|
|
|
| M |
|
|
|
|
| L |
|
|
|
|
| XL |
|
|
|
|
| XXL |
|
|
|
|
| XXXL |
|
|
|
|
XD-5
| Size |
12mm |
10mm |
7mm |
5mm |
| XS |
|
|
|
|
| S |
|
|
|
|
| M |
|
|
|
|
| L |
|
|
|
|
| XL |
|
|
|
|
| XXL |
|
|
|
|
| XXXL |
|
|
|
|
Cheek Pad Thicknesses
CORSAIR-X RC
| Size |
Thicker (mm) |
Standard (mm) |
Thinner (mm) |
| XS |
– |
– |
– |
| S |
30 |
25 |
20 |
| M |
30 |
25 |
20 |
| L |
25 |
20 |
15 |
| XL |
20 |
15 |
12 |
| XXL |
– |
– |
– |
| XXXL |
– |
– |
– |
CORSAIR-X
| Size |
Thicker (mm) |
Standard (mm) |
Thinner (mm) |
| XS |
30 |
25 |
20 |
| S |
30 |
25 |
20 |
| M |
30 |
25 |
20 |
| L |
25 |
20 |
15 |
| XL |
25 |
20 |
15 |
| XXL |
20 |
15 |
– |
| XXXL |
– |
– |
– |
SIGNET-X / QUANTUM-X / CONTOUR-X / REGENT-X
| Size |
Thicker (mm) |
Standard (mm) |
Thinner (mm) |
| XS |
30 |
25 |
20 |
| S |
30 |
25 |
20 |
| M |
30 |
25 |
20 |
| L |
25 |
20 |
15 |
| XL |
25 |
20 |
15 |
| XXL |
20 |
15 |
– |
| XXXL |
– |
– |
– |
RAM-X
| Size |
Thicker (mm) |
Standard (mm) |
Thinner (mm) |
| XS |
30 |
25 |
20 |
| S |
30 |
25 |
20 |
| M |
30 |
25 |
20 |
| L |
25 |
20 |
15 |
| XL |
25 |
20 |
15 |
| XXL |
20 |
15 |
12 |
| XXXL |
– |
– |
– |
XD-5
| Size |
Thicker (mm) |
Standard (mm) |
Thinner (mm) |
| XS |
30 |
25 |
20 |
| S |
30 |
25 |
20 |
| M |
30 |
25 |
20 |
| L |
25 |
20 |
15 |
| XL |
25 |
20 |
15 |
| XXL |
20 |
12 |
– |
|
|
|
|
VX-PRO4
| Size |
Thicker (mm) |
Standard (mm) |
Thinner (mm) |
| XS |
30 |
25 |
20 |
| S |
30 |
25 |
20 |
| M |
35 |
30 |
25 |
| L |
30 |
25 |
20 |
| XL |
30 |
25 |
20 |
| XXL |
30 |
25 |
20 |
| XXXL |
– |
– |
– |
CLASSIC-V
| Size |
Thicker (mm) |
Standard (mm) |
Thinner (mm) |
| XS |
30 |
25 |
20 |
| S |
30 |
25 |
20 |
| M |
30 |
25 |
20 |
| L |
25 |
20 |
15 |
| XL |
25 |
20 |
15 |
| XXL |
20 |
15 |
12 |
| XXXL |
– |
– |
– |
Cheek Pad Thicknesses 40mm and 35mm Cheek Pads are available by special request. Please see your local authorized Arai dealer or visit us at the araiamericas.com website.
THREE ARAI HELMET SHAPES
ROUND OVAL | QUANTUM-X
The Round Oval shape was designed for riders whose heads are slightly wider rather than elongated. The Round Oval shape was achieved by using an interior head liner that combines thicker front and rear pads with thinner side pads.
INTERMEDIATE OVAL | CORSAIR-X, CONTOUR-X, REGENT-X, RAM-X, CLASSIC-X, XD-5, and VX-PRO4
Our Intermediate Oval shape is our standard interior shape. The Intermediate Oval fits the majority of head shapes in the North American markets.
LONG OVAL | SIGNET-X
The Long Oval shape was designed for riders with a narrow head and a more pronounced forehead. The Long Oval was created by increasing the space of the EPS liner front to back and decreasing the space side-to-side.
