Race cycling helmet suitable for men sizes 51 55 cm 55 59 cm 59 63 cm us sizes s m l main colour black secondary colour yellow number of air vents 26 safety features flashy colour neon inner padding antibacterial size adjustments wheel adjustment system strap adjustable construction in mold outer material polycarbonate weight 270 g inner material polystyrene eps helmet technologies giro roc loc 5 giro slimline webbing giro x static padding