RaceQuip 274992 SportMod Flat Black Small 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: 6-7/8 to 7 (21-1/2 inch to 22-1/8 inch circumference)