New Athletic Mountain Bike Cool Adjustable Helmet of Unibody Design IN MOLD TECHNOLOGY-to reduce the consequences of accidents to a minimum.The In-Mold technology allows us to cast the external polycarbonate cap directly during the injection stage of the expandable polystyrene (EPS). head girth: 56-63cm, head width is 18cm. EADJUSTABILITY - CUSTOM FIT-Our leggendary fit is a result of scientific studies on the human head, design innovation, materials advance and manufacturing techniques. Adjustable and removable device and protective pad liner make this bike helmet perfect COMFORT - INTERNAL PADDING-erfect shaping of the caps, highly-advanced retention systems and internal padding are essential. SAFETY-The structure of our helmets combines expanded polystyrene (EPS), a material which can disperse the force caused by an impact through a plastic deformation and polycarbonate shell for increased durability and protection.