abus airbreaker road bike helmet 2.0 – Lightweight Bike Helmet with a Focus on Ventilation, Aerodynamics, Safety and Comfort for Professional Cycling – for Women and Men – Size M, All-in-Purple Nicaragua Nicaraguan Flag 16In a sleek aerodynamic design F12178 Head circumference:53 - 55 cm

abus airbreaker road bike helmet 2.0 – Lightweight Bike Helmet with a Focus on Ventilation, Aerodynamics, Safety and Comfort for Professional Cycling – for Women and Men – Size M, All-in-Purple Nicaragua Nicaraguan Flag 16In a sleek aerodynamic design F12178 Head circumference:53 - 55 cm

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However, it's important to be aware that while some companies may claim their helmets are meant for these activities, it's usually a proprietary set of standards set by the company, not standards set by the CEN or UIAA

F12178

Head circumference:53 - 55 cm

perforations on the palm and fingers - to allow for extra ventilation

a sleek aerodynamic design