Rawlings Coolflo technology, first introduced in 2006, forever revolutionized batting helmet protection with its state-of-the-art venting system and sleek, aerodynamic look. Initially worn by all Major League Baseball athlete. Specifically constructed for the athlete desiring a helmet with an established history of excellence along with pro-inspired attributes. Rawlings Coolflo models will continue to redefine the standards of traditional helmet design. Meets NOCSAE standards. One Size fits most sizing: 6 1/2" - 7 1/2"