Specialized Propero 4 Helmet Redefining fast. The Specialized Propero 4 Helmet combines some of the best cutting-edge technologies from Specialized's top-performing helmet offerings, the Evade 3 and Prevail 3, with top-level protection and comfort, resulting in a fast, comfortable, breathable helmet for high-level performance. The Propero 4 uses The S-Works Evade 3 front-end design for unmatched aerodynamic efficiency and the ventilation from the Prevail 3 for high-level airflow. Beyond the airflow and aerodynamics, Specialized dove into the details when designing the Propero 4, resulting in a refined design and the FS3 fit system for all-day comfort. The MIPS-C solution reduces rotational forces from certain impacts while minimizing weight, on top of an impressive 5-Star Virginia Tech(R) Helmet Rating(TM). The Propero 4 sets a high bar for protection, comfort, and performance. Features5-Star Virginia Tech(R) Helmet Rating(TM) for an impressive level of crash protection Unbeatable airflow and aerodynamics with aerodynamics borrowed from the S-Works Evade 3, and ventilation from the Prevail 3Mips-C protection technology to reduce rotational forces caused by certain angled impacts FS3 Fit System & Occipital Base Adjustment for an optimized fit for every head shape, and the ability to adjust for eyewear Premium, precision full-wrap polycarbonate shell for a refined look, and exceptional durability Tri-Fix webbing with thinner straps for reduced wind noise and lighter weight Sunglasses storage for easy stowing of sunglasses when conditions change, or during extended climbs SPECIFICATIONSClosure system Buckle Intended Use Road, Road Race Weight N/ASizing Size Small Medium Large Head Circumference (cm)51 - 56cm55 - 59cm58 - 62cm | Specialized | Propero 4 Helmet Cpsc Men's | Size Medium In Black