Dual compound sole. Composite inner sole..   The patented and trademarked Vertebra System protects the rider?s Achilles tendon. Tecno VR adjustable calf system. Replaceable thermoplastic resin ankle ball protection cup. Bolt on (no Velcro!) replaceable, adjustable and aerodynamic nylon scuff pads on the toe. Replaceable nylon shin deflector plate. Shock absorbing heel cup. DuPont polymer toe shift pad. Removable arch support.      Built around a lady specific foot mold. Features a unique graphic appliqué to set the boot apart from the men?s version. An elastic panel adjacent to the entry zipper allows a bind free zip and improved fit. Closable air vent.