Our most durable Polycarbonate shell Optimized for backswing impact protection Customizable, sized fit Fast-drying, removable, and washable 3D mesh liner Textured sand-matte painted finish Visor equivalent to a 3-stitch plate cap Sizing as follows: SML = 6 3/4 - 7 MED = 7 - 7 1/8 LGE = 7 1/4 - 7 3/8 XLG = 7 1/2 - 7 5/8 Across all manufacturers, traditional skull caps are not certified to NOCSAE standards.