Designed with a fuss-free, fully adjustable fit system with a zipper slider for an easy custom fit. Head stays cool with a shiny micro shell exterior with mesh covered vents to keep dirt and debris out whil promoting maximum air circulation. High impact absorbing polystyrene liner, cushioned foam, anti-microbial, removable headliner and adjustable head restraint harness with quick release buckle. Meets ASTM F1163-00 standards and is SEI certified.