For successful cycle racing: Light, solid in-mold racing bike helmet with a durable combination of EPS and PC shell - individual fit due to Zoom Ace adjustment system with the precise adjustment dial Safe even at high speeds on the bike: Good head protection thanks to ActiCage Lite - with structural reinforcement in the EPS for optimal stability Innovative Multi Speed Design with honeycomb structure: For precise control of airflow - optimum aerodynamics on fast, flat stages and optimal ventilation on slow, mountainous stages Technical details: Unisex helmet for adults, weight 200 g, colour silver white, size S = head circumference 51-55 cm Safe, reliable and stable. That is what the name ABUS stands for. Whether it is protection at home, object security or mobile security: ABUS sets the standards.