The charles owen pro ii skull cap is designed to keep your head safe and cool its kitemarked and conforms to pas015 bsen1384 and astmf1163 safety standardswhen combined with the charles owen helmet cover ventilation slots located at the front and back of the helmet allow air to flow while interwoven silver ions within the super soft headband provide anti microbial protection against sweat and odours the slim and stylish appearance of the hat doesnt compromise on safety and the grpx tec