Helmets
Size 3XS 2XS XS S M L XL 2XL 3XL
CM 49-50cm 51-52cm 53-54cm 55-56cm 57-58cm 59-60cm 61-62cm 63-64cm 65-66cm
Interior Cheek Pad/Ear Cup Thickness*
Helmet Cheek pads Ear cup
Size RX-7 Quantum Astral Signet VX-Pro MXC-Pro Pro Classic/m SZ/m SZ/Ram III
Optional 40mm 40mm       40mm        
Optional 40mm 40mm   35mm 35mm   35mm      
3XS   35mm                
2XS   30mm                
XS Std. 35mm 35mm 35mm 30mm 30mm 35mm 30mm 30mm 35mm 35mm
S Std. 30mm 30mm 30mm 25mm 25mm 35mm 25mm 25mm 30mm 30mm
M Std. 30mm 30mm 30mm 25mm 25mm 35mm 25mm 25mm 30mm 30mm
L Std. 25mm 25mm 25mm 20mm 20mm 30mm 20mm 20mm 25mm 25mm
XL Std. 25mm 25mm 25mm 20mm 20mm 30mm 20mm 20mm 25mm 25mm
2XL Std. 20mm 20mm 20mm 15mm 15mm 25mm 25mm 15mm 20mm 20mm
3XL Std.       15mm       15mm 20mm  
Optional 15mm 15mm 15mm 12mm 12mm 20mm 12mm   15mm 15mm
Optional 12mm 12mm 12mm     15mm        
Shell I/O R/O I/O L/O            

*Current size applications. However, note that changes and updates can effect the standard pad-thickness supplied with your helmet.

Interior Comfort Lining Thickness
Helmet
Size
Lining
Code
12mm
Thickness
10mm
Thickness
7mm
Thickness
5mm
Thickness
3XS* I Opt. Std. Opt. Opt.
2XS* I Opt. Opt. Std. Opt.
XS II (S) Opt. Std. Opt. Opt.
S II (S) Opt. Opt. Std. Opt.
M III (M) Opt. Std. Opt. Opt.
L III (M) Opt. Opt. Std. Opt.
XL IV (L) Opt. Opt. Std. Opt.
2XL IV (L) Opt. Opt. Opt. Std.
3XL* V Opt. Opt. Std. Opt.

 

*Not available for all models of helmets

Removable/replaceable comfort liners, along with cheek pads, that allow you to customize the fit of Arai Helmets.

Interior Shell Shapes
1. "LONG OVAL"
(very long front-to-back, very narrow side-to-side). Fit is represented by Profile series, Signet Series, Renegade Series, Tracker Series, offering additional forehead room for those who find that most helmets have pressure points in the forehead
2. INTERMEDIATE/RELAXED OVAL
(a little shorter front-to-back and a little wider side-to-side than the Long Oval). Fit is represented by 2006 RX-7 Series, Corsair Series, Vector, Astral Series, MXC-Pro, and VX-Pro, which begins the shift from oblong towards round.
3. ROUND OVAL
(even a little shorter front-to-back and a little wider side-to-side). Fit is represented by both the Quantum Series, RX-7RR and Astral-X models.

The Astral-X has a slightly more "relaxed" fit - a bit more room in the forehead area - mainly because the Astral has a non-removable liner.

The Quantum-2's liner on the other hand, is fully removable, which makes it feel a bit more "round".

 

SIZING INFORMATION IS PROVIDED BY THE MANUFACTURER AND DOES NOT GUARANTEE A PERFECT FIT.
PLEASE USE THIS CHART AS A GUIDE ONLY.