Bell overdrive helmetwith clean lines and a modern compact shape the overdrive features key trickledown technologies from bells pro level helmets the overbrow ventilation channels cool air over the head to regulate temperature new lightweight kit uses special webbing thats lighter and less absorptive to sweat up your road riding game shift into overdrive features in mould polycarbonate shelllightweight kitoverbrow ventilationtag fit systemweight 285gvents 19 ventscertification ce e