Spider SRS is the new choice for the high performance, high mileage Cross Country rider or Cyclocross racer. Patented Sidi Sole Replacement System for increased shoe life. Patented Sidi Sole Replacement System for increased shoe life. New, integrated Ruber Toe Guard. Breathable, supple and durable Lorica Microfiber Upper with cooling mesh panels. Caliper Buckle for easy on the bike fit adjustment. Soft Instep Closure System and padded tongue eliminate pressure points. High Security Velcro won't shift or slip. Vented, reflective heel cup. Optional Toe Spikes.