This helmet is contoured to your head allowing ear and neck comfort. Front and back ventilation helps keep your head cool and dry. Turn dial to adjust fit. Padded lining adds for a soft, comfortable fit and is removable for easy cleaning. Easy adjusting nylon harness with smooth leather overlay. ASTM-SEI Certified
Small/Medium 6 1/2" - 6 7/8" Medium/Large 6 7/8" - 7 3/8"