CONSTRUCTION: In-mold - EPS liner, polycarbonate shell * VENTILATION: 6 vents with internal channeling * FEATURES: Stylish brim, In-Form fit system for added security, light weight * S 20-21.75 / 51-55 cm, M 21.75-23.25 / 55-59 cm, L 23.25-24.75 / 59-63 cm * SUGGESTED USE: Urban/Commute, Recreational MTB, MTB Trail Ride, Dirt Jump500