Oakley's ARO3-Australia helmet is built with optimized ventilation to help keep you cool. It has a moisture wicking brow pad and BOA's 360 degree fit system for the ultimate in comfort and fit. The TX1 Lace lies flat against your head, allowing for seamless eyewear integration. The ARO3 includes the MIPS brain protection system to protect against impact that can come from any direction. This helmet is engineered for those unforgiving climbs and blistering heat.. Optimized ventilation . Eyewear Dock . BOA 360 Fit System . MIPS Brain Protection System . X-STATIC Brow Padding with Silver Technology inhibits bacteria growth on fabric . Helmet Travel Bag and Oakley Decal Included . CPSC 1203, EN1078 and ANZ2063 Certifications . Sizes: Small (52-56cm) / Medium (54-58cm) / Large (56-60cm)