TX-501. Built for the city. The TX501 builds on the authenticity and innovation of Bell's historic 500-TX. It brings modern features and performance to the classic Bell open face helmet silhouette. Features like the integrated drop-down sun shield, Velocity Flow Ventilation, premium micrometric buckle closure, communications compatibility, luxurious and removable comfort liner, and a brand-new composite shell - providing best-in-class performance and modern global certifications. Multiple shield color options, a multi-density EPS liner, and a Class 1 optics integrated sun shield make the TX501 a premium option for aesthetic and performance-minded riders. Built for the modern rider, the TX501 looks equally good in the city or on the open road. Four Shell Sizes - Typical offering requires additional padding sizes to accommodate all head sizes.