Vertebra system Achilles and rear calf protection panel. Replaceable nylon toe scuff pad. Replaceable outer ankle protective cap. Nylon shin deflector plate. Fully encapsulated heel cup. DuPont polymer toe shift pad. An elastic panel adjacent to the entry zipper allows a bind free zip and improved fit. Removable arch support. Double stitched in all high stress areas. Zipper and Velcro closure system. Lorica outer construction. Perforated Teflon treated nylon lining.