Charles Owen Pro II Skull Helmet The most breathable dual standard cross country helmet in a wide range of colours. The Helmet has ventilation slots located at the front and back to allow air to flow. Interwoven silver ions provide anti-microbial protection against sweat and odours. The GRpx technology harness creates an unparalleled fit. Kitemarked to PAS015:2011 and certified by SEI to ASTM F1163.