RaceQuip 274995 SportMod Flat Black Large SA-2010 Full Face Helmet Exceeds Snell SA-2010 rating Hand laid fiber glass shell Expanded polystyrene (EPS) liner Comfort fit blended Nomex interior Distortion free 3 millimeter polycarbonate low fog shield; helmet dimensions: 7-3/8 to 7-1/2 (23-1/8 inch to 23-3/4 inch circumference)