The Charles Owen JS1 Pro Jockey Skull is a lightweight and deep-fitted jockey skull designed with an impact-resistant Acrylonitrile Butadiene Styrene shell and comes with 10 ventilation slots to keep you cool while riding. The leather harness with nylon webbing and a suede padding provides comfort and support under the chin. It meets safety standards: ASTM F1163-15, PAS015:2011, VG1 01-040 2014-12. This hat is also available in Round or Oval Shape. Please note SEI certified to ASTM F1163-15 only on sizes 54cm to 61cm. Riding hats are precision made and should be protected from extremes of temperatures. They should be allowed to dry naturally when they get wet and also they must be protected from blows or damage from being dropped.