The Arai Quantum-ST PRO motorcycle helmet features the long oval head shape. This specific shape offers a longer front-to back distance and a slightly smaller side-to side distance compared with the standard Arai head shape. The Quantum-ST PRO is acknowledged as the premium sports touring helmet, preferred by experienced touring and sports riders alike. The new Quantum-ST PRO edition enhances the strong features of the ST model even further with the standard PRO Shade System visor fitted, even more room around the mouth and nose and integrated speaker pockets in the cheek pads for a communication system. Also exclusive to the PRO version is the new Ecopure lining material offering new levels of comfort. The Quantum-ST PRO combines racing RX-7 GP technology with the comfort level needed for all day long touring riding. The shell is 40% stronger than standard fibre glass in extension and bending resistance. The Quantum ST Pro has two layers of Super Fibre, one middle layer of special fibre. Arai takes comfort and fi t to new lengths with Quantum-ST PRO long interior Shape. The Quantum-ST Pro also features a full ventilation system, an emergency release system (to allow easier access to an injured rider) facial contour system for a snug and comfortable fit aswell as a speaker pocket (speaker not included) clear visor as standard.