The FUELL Ebike Helmet is a collaboration with ABUS that combines modern safety technologies with a variety of useful features which are characterized by the integrated rain hood, bright rechargeable taillight, replaceable visor and removable warming earmuffs.Meets high safety requirements; CPSC in the US, CE and NTA 8776 in EuropeIn-Mold for a durable connection with the outer shell and shock-absorbing helmet material (EPS) for added safety Integrated LED taillight with 180Adeg visibility 4 air inlets and 9 air outlets connected with flow channels provide excellent ventilationAdjust sizing with a form fitting adjustable ringQuickly take the helmet on and off with the magnetic strap buckle.Medium: 20-22.5cm, 410gLarge: 22-24.5cm, 430g.