Q.R.S.A. (Quick Release Self-Adjusting) Base Plate System
AIM+ Shell Construction
Aero Edge 2 Spoiler
Dual-Layer EPS Liner
3D Max Dry Interior System
E.Q.R.S. (Emergency Quick Release System)
Size Chart for the Shoei X-12 Marquez Helmet
Wrap a tape measure horizontally around your forehead.
Select the helmet that is the closest fit to that size. A helmet should fit snug on your head.
If it moves while wearing, it is too large. If it is painful to wear, it is too small.