The Oakley ARO3 Endurance adult bike helmet is a versatile helmet for everyday road cyclist. Whether commuting to work on a busy street or enjoying a weekend ride along scenic roads, the ARO3 Endurance is the perfect companion to get you to where you need to go with safety and style. This bike helmet features the Oakley BOA® 360 micro-adjustable fit system designed to optimize the fit experience of the rider. This system is both height adjustable and features a micro-adjustment dial on the back of the helmet for a customized fit every cyclist will appreciate.