Size: 57-Medium: Stilo Zero 8860 Helmets are aimed at professional racers needing to satisfy the strict FIA 8860 regulation, or any race driver serious about helmet safety. This certification provides an unparalleled level of puncture protection as well as impact resistance. Nowhere will you find a safer helmet. The shape of the Formula is conducive to use in open and closed cockpit cars. The optional Aero kits will optimize airflow over the helmet for open cars.