The SIDI ST Boot features a hinged external support structure for helping to prevent lateral ankle movement while allowing for smooth fore and aft transitions on the bike. A set it and forget it cam lock closure system on the calf enables easy entry and accommodates a wide variety of calf diameters. All bolt-on components are replaceable. Features: ā¢ Patented and trademarked Sidi Vertebra SystemĀ protects theĀ achilles tendon ā¢ Thermoplastic resin ankle protection ā¢ Replaceable to sliders ā¢ Composite inner sole ā¢ Removable arch support ā¢ Nylon shin deflector plate ā¢ Perforated Lorica outer construction ā¢ Double stitched in all high stress areas ā¢ All bolt on parts are replaceable ā¢ An elastic panel adjacent to the entry zipper allows a bind free zip and improved fit ā¢ Dual compound sole ā¢ DuPont polymer toe shift pad ā¢ Perforated Teflon treated nylon lining ā¢ Replaceable shock absorbing heel cup ā¢ Padded achilles area ā¢ External ankle support braces with closable air vents ā¢ Cam-lock buckle system
