Kali Protectives Maraka Road Helmet, Zone White, Small/Medium COMPOSITE FUSION PLUS technology featuring geometric shapes of softer EPS foam next to your head, right where you want them. Revolutionary mix of carbon fiber and polycarbonate materials Introduction of SUPERVENT technology providing reinforced super-structure to critical airflow vents BUMPER FIT SYSTEM assures a secure fit with special pads designed of an absorbent cross-linked polymer material DUAL CLOSURE SYSTEM allows a simple and efficient dual-sided closure adjustment at the rear of the helmet. S/M fits 54-58 cm (hat size 6 3/4 - 7 1/4)