Rawlings Coolflo Matte Style Alpha Sized Base Coach Helmet ABS plastic shell for classic performance Base coach batting helmet with no ear flaps COOLFLO venting technology lets air flow through the helmet S (6 7/8 - 7), M (7 1/8 - 7 1/4), L (7 3/8 - 7 1/2), XL (7 5/8 - 7 3/4)