Schwinn Codex Microshell Bicycle Helmet: * Helmet Type: adult bicycle helmet * Safety Features: dial-fit retention system allows for easy, on-the-fly adjustments * Removable visor protects you from the elements * Side strap adjusters assist in a proper fit * Rear-exhaust ports enhance air flow * Ventilation: 15 flow vents circulate air and keep you cool * Design: light gray base with yellow and black graphics * CPSC approved * Fits Head Circumference: 22.83" to 23.62"