Mizuno Prospect Batters Helmet The new design of the Mizuno Prospect Batter's Helmet uses a durable ABS plastic shell in a two-tone color style for sleek protection at the plate. Inside the shell is EVA foam and a DryLite™ liner. Marked and pre-drilled holes allow for a player to attach a mask, if desired. Removable chin strap snap. Meets NOCSAE standards. Fits size 6- 6 3/4 or head circumference of 19- 21 1/4".