Engineered for those unforgiving climbs and blistering heat, Oakley AR03 is built with optimized ventilation to help keep you cool, BOA FS1-1 360-degree fit system, and a MIPS Protection System. Key Features of Oakley AR03 Bike Helmet: Lightweight Polycarbonate Shell. Vane Support Structure. 360-degree Fit Band. X-Static Brow Padding. EPS Protective Foam. MIPS Protection System. BOA Fit FS1-1 fit system.