Meteor Marven M Helmet 55-58 cm Black and Mint 24793 Meteor bicycle helmet with a lightweight PVC construction. The EPS foam shell absorbs impact energy, providing head protection while riding. 23 ventilation holes. Adjustable circumference. Fixed visor. Removable, washable liner. Reflective elements. Technical data: · Material: PVC/EPS · EN1078 certificate: a product complies with the European safety standard for helmets intended for users of bicycles, roller skates, inline skates, and skateboards · Size M: adjustable 55-58 cm · Fit Size System - headlock multi-stage ring for smooth circumference adjustment; using one hand, you can easily adjust the helmet to your head using a small knob located at the back of the helmet · Air Flow System: 23 ventilation holes ensure proper air circulation