Charles Owen V8 Riding Helmet (Black, 6 7/8 (56 cm)) Safety: 2011Certified by SEI to ASTM F1163 and Kitemarked to PAS015:2011. Colours: Black/Black, Black/Silver, Navy/Navy, Navy/Silver Sizes: 6 5/8 - 7 1/2 (54 cm - 61 cm)