Bern Watts Carbon EPS Matte Finish with Black Knit Helmet Certified ASTM F2040, CPSC and EN1078 Carbon Outer shell with EPS sets a new bar for quality combined with the lightest bomber head protection around Doesn't look like a spaceship landed on your head Fits Head circumference 55.5-57 cm or 21 7/8-22 1/2 inches