Diffuser Type 10: Newly equipped with ‘’Air In Stabilizer’’, an additional air intake between the front and rear intake in the diffuser and large toggles. The Air-In ports help accelerate air out the back, increasing airflow without increasing the size of the holes in the shell. The reshaped and aligned front intake scoops, flow more air into the helmet utilizing the same 10mm size holes. This new diffuser guides more air in and more air out, using aero dynamic design instead of simply making bigger holes or larger, and therefore noisier and less aero dynamic vents. The reshaped Delta Duct 5 air intake increases air flow and lowers noise levels. Thanks to this new ventilation system, interior temperatures are lowered much faster than with previous versions. Size from XS to XL.