Download Vicis Helmet Size Chart Background. When taking your head measurement, measure the largest circumference, usually found at your your temple. Traditional helmet sizes are small, medium, large, and extra large.
Inside leg measured from the crotch to the ground.
Helmet sizes are based on the circumference of your head. Vicis hired the seattle design firm artefact to help with the zero1's look. In today's video, jay builds a custom ordered vicis helmet. The difference is in how the helmet fits over the rider's head.