the giro foray black helmet 2016 presents a simplified and elegant design offering comfort and lightness. the roc loc 5 locking system ensures a perfect fit, stability, adaptability and weight savings. with roc loc 5 it is possible to adjust the tension and adjust the vertical position with one hand. when turning the dial feels tighter in rough terrain. copyright retto.com returning to rotate it, loses tension, for more flat terrain or quieter outputs. it has a polycarbonate shell in-mold eps interior for greater security and protection. for a good ventilation has 21 openings. features: -road. -elegant and simplified design. -adjust roc loc 5 system. -lightness. -maximum safety and protection. -construction of polycarbonate in-mold interior eps. -plush interior. -21 vents with internal channeling. -breathable belt. -size super fit.