Marucci Adult Team Speed Batting Helmet Impact grade ABS, vn foam, EVA foam and poly-comfort foam Pads laminated with moisture Wicking fabrics Rubberized paint finish Meets nocsae standard Adult extra small : 6 - 6 3/4 ; Adult small : 6 3/8 - 6 7/8 ; Adult medium: 6 7/8 - 7 1/4 ; Adult large : 7 1/4 - 7 5/8