HJC CL-16 Solid Helmet - Small/Matte Black Advanced Polycarbonate Composite Shell Lightweight, superior fit and comfort using advanced CAD technology Aerodynamic shell shape reduces turbulence Impact absorbing, multi-density EPS liner ACS Advanced Channeling Ventilation System Scoop top intake vent combine with rear exit vents to provide flow-through ventilation, helping to pull heat and humidity up and out of the helmets interior