We do custom headset installs! Give us a call for full details and pricing! All sales are final once headset is installed in helmet. Features: Advanced Polycarbonate Composite Shell is lightweight with superior fit and comfort using advanced CAD technology Aerodynamic shell with large eyeport for greater visibility Impact absorbing, single-density EPS liner One-touch integrated smoke-tinted inner sun shield deploys and retracts quickly and easily and is adjustable to three positions ACS Advanced Channeling Ventilation System provides flow-through ventilation Multi-Stage intake vents and exhaust vents allow full front to back fresh airflow that flushes heat and humidity out of the helmet Moisture-Wicking and odor-free interior with advanced SuperCool antibacterial fabric Comfortable, removable and washable grooved interior in the temple area for riders who wear glasses HJ-17R Shield QuickSlide shield replacement system allows for quick, secure and tool-less shield removal and installation Optically correct face shield offers 95% UV protection Nylon Strap Retention System neatly secures chin strap with dual D-Ring closure Peak visor included 2 shell sizes and 2 EPS sizes SizeHat SizeMeasurement (in) 2XS 6 3/8 - 6 1/2 20 - 20 1/2 XS 6 5/8 - 6 3/4 20 7/8 - 21 1/4 SM 6 7/8 - 7 21 5/8 - 22 MD 7 1/8 - 7 1/4 22 1/2 - 22 7/8 LG 7 3/8 - 7 1/2 23 1/4 - 23 5/8 XL 7 5/8 - 7 3/4 24 - 24 3/8 2XL 7 7/8 - 8 24 3/4 - 25 1/4 3XL 8 1/8 - 8 1/4 25 5/8 - 26 4XL 8 3/8 - 8 1/2 26 3/8 - 26 3/4 5XL 8 3/4 27 1/4 - 27 5/8