TCX S-Zero Boots Borrowing from the technology of our S-Race boot, the S-Zero offers the maximum amount of protection from an entry level track boot, while utilizing our MCS (Metatarsal Control System) for comfort and safety on the bike and off. This Lorica boot is unmatched in comfort and side impact protection for an entry level race boot. Replaceable sliders available. Upper micro fibre with wide front and back padded areas to increase comfort and flexibility Lining AIR TECH breathable Protections NEW polyurethane shin plate, NEW malleolous protection polyurethane shift pad, NEW heel counter Sliders NEW replaceable polyurethane toe slider and fixed polyurethane calf slider Closure elastic zip and Velcro band Mid sole NEW antibacterial, reinforced with ANTISHOCK and ANTIVIBRATION heel insert Sole NEW mono compound rubber sole with specific grip area