The Mizuno MVP Helmet is a durable ABS plastic shell. It contains a DryLiteŽ liner for breathability and moisture management. Mask is not included, but there are pre-drilled holes if the player would prefer to attach a separate mask. EVA foam for comfort. Meets NOCSAE standards. Fits hat size 6 3/4- 7 3/4, or head circumference of 21 1/4"- 24 1/4".