The Titan is a super light Moto X helmet that I recommend highly for DH riders. A Moto helmet can handle an impact much better than a bicycle helmet. They have a better fit and the O?Neal?s have special programs for crash replacement. The Titan has Moto ventilation under the visor. A sort of air induction system keeps your head cool. The inner padding can be cleaned and it comes with a nice helmet bag for storage. Many Downhill riders have crossed over and wear Moto helmets. You should be next! Size Medium (Grey) fits 58cm. Size Large, (Grey) fits 60cm. Size XL (White Red) fits head size 62cm.