SOA inspired helmet Fits great !!! World's Smallest Lightest DOT approved Polo Helmet here in the United States!  •ALL beanie helmets now come with quick release straps!  •Smallest DOT shell size ever made  •Inspired by the hit Biker TV Show  •Meets or exceeds D.O.T. FMVSS No.218 standards  •Sits low on your head  •Made of Fiberglass  •Only use water to clean our helmets  •To measure your head for the correct size take a tape measure just above your brow around your head just at the top of your ears. If your head measures in between sizes order the size smaller. Our helmets should fit snug when new they stretch and mold to the shape of your head. How to measure your head: Size                               cm                       inches XXS                         50.8-52.07            20-20 1/2 XS                           53.02-53.98          20 7/8-21 1/4 S                             54.93-55.88          21 5/8-22 M                            56.83-57.73           22 3/8-22 3/4 L                             59.05-60.00           23 1/4-23 5/8 XL                           60.96-61.91           24-24 3/8 XXL                         62.87-64.12            24 3/4- 25 1/4