Mypick Electric Bicycle Helmet Summer Half Helmet A-Class National Standard 3C Certified Sun Protection Breathable Unisex Safety Helmet for Electric Scooters And Motorcycles Fashionable Gray with Short Visor

Helmet size is manually measured with a 1-3mm error margin.

Measure from the prominent point of the forehead, around the temples and back of the head to the protruding point at the back of the head. This measurement provides the correct size for helmet fitting. Avoid measuring over the eyes or the top of the head.