The patented and trademarked Vertebra System protects the riders Achilles tendon Replaceable thermoplastic resin ankle ball protection cup Bolt on (no Velcro!) replaceable, adjustable and aerodynamic nylon scuff pads on the toe Composite inner sole Removable arch support Replaceable nylon shin deflector plate Lorica outer construction Closable air vent Double stitched in all high stress areas All bolt on parts are replaceable An elastic panel adjacent to the entry zipper allows a bind free zip and improved fit Dual compound sole DuPont polymer toe shift pad Perforated Teflon treated nylon lining Shock absorbing heel cup Techno VR adjustable calf system Built around a lady specific foot mold Features a unique graphic appliqu to set the boot apart from the mens version