RaceQuip 274996 SportMod Flat Black X-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: 7-5/8 to 7-3/4 (24 inch to 24-1/2 inch circumference)