Tuned for speed and ready for heart-pounding sprint finishes, ARO5 is an aerodynamic and comfortably lightweight design.EYEWEAR DOCK: Integrated eyewear dock to securely stow your shades and keep them handy for quick and easy access.BOA 360 FIT SYSTEM: With its soft textile feel and flexibility, the TX1 Lace lies flat against your head, allowing for seamless eyewear compatibility.X-STATIC BROW. Also ships with secondary set of pads.Helmet Travel Bag and Oakley Decal Included, Small (52-56cm) / Medium (54-58cm) / Large (56-60cm), CPSC 1203, EN1078 and ANZ2063 Certifications. Shell Material: lightweight polycarbonate. EPS foam, MIPS low-friction liner. Ventilation: wide ventilation channels at front, top scoop with rear exhaust vents. Fit Adjustment: Boa FS-1 dial with 360-degree fit. Certifications: CPSC