In mold polycarbonate shell in molding is the process of bonding the helmets micro shell to its eps foam layer to provide a sturdier more solid helmet the eps foam is shot into the thin micro shell cap when its in the mold thus the name rather than formed separately and taped on later overbrow ventilation system the overbrow ventilation system uses carefully placed and shaped vents that help channel in cool air and draw out heat and moisture you can now stay cool comfortable and more