The Full Cut Helmet is a retro masterpiece, raised by the godfathers of action sports and now back in demand it's better than ever. Depending on colour the shell is either constructed from high-impact ABS or high-density polyethylene, lined with EPS foam and outfitted with compression molded pads to ensure the Full Cut is comfortable. Eleven open vents across the helmet let airflow in and out to keep you riding longer without feeling uncomfortable. Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older Size guide: XXX-Small: 47 - 49cm XX-Small: 49 - 51cm X-Small: 52 - 54cm Small: 54 - 56cm Medium: 56 - 58cm Large: 58 - 60cm X-Large: 60 - 62cm XX-Large: 62 - 64cm