The Sidi Vertigo Boots. The patented and trademarked Vertebra System is retained in the Vertigo making the boot a highly articulated piece of technology. Each vertebra panel moves independently which allows enhanced performance and, at the same time, also forms a shield protecting the rider?s Achilles tendon. ? The Sidi Vertigo Boot features a replaceable thermoplastic resin ankle ball protection cup. ? Bolt on (no Velcro!) replaceable, adjustable and aerodynamic nylon skid pads on the toe. ? The shin deflector plate of the The Sidi Vertigo Boot is the only replaceable deflector plate available in racing today. The The Sidi Vertigo Boots' shin plate features matte finished Nylon thermoplastic resin construction. As you can see, Sidi has achieved a dizzying height of technical development with the Vertigo boot?.so much so that part of the reason the series is named the Vertigo is because of the effect it will have on our competitors.