Lightweight glossy polycarbonate and polystyrene road and triathlon cycling helmet in white. · Aero Control aerodynamic technology · HyVent airflow technology · Adjustable Micro Dial Octo-fit system · Washable, hypoallergenic ECO faux-leather chinstrap · Breathable, quick-drying interior · Detachable anti-bacterial anti-static Resistex® padding · Includes textile carry bag · Helmet standards: CE EN 1078, CPSC 1203, AS/NZS 2063 Supplier color: White/Black Helmets Size: Head Circumference S: 19.7–22 in / 50–56 cm M: 20.5–22.8 in / 52–58 cm L: 23.2–24.4 in / 59–62 cm