Constructed for high-performance, high-mileage, cross-country riders and cyclocross racers, the SIDI Spider SRS Carbon Technomicro MTB Shoes now feature a lighter, stiffer Carbon Composite SRS Sole, plus a new microfiber upper that's breathable and weather-resistant. The updated sole mimics the former Dragon Carbon SRS Sole with its rigid, powerful platform and forgiving flex for aggressive terrain. Sole Replacement System uses replaceable tread blocks in the most wear-heavy zones to increase shoe life and optimize traction. There's even a larger, anti-slip insert beneath the instep which helps during those less-than-perfect cyclocross remounts. Integrated Rubber Toe Guard protects your toes from accidental hits and Adjustable Heel Security System eliminates power-robbing heel lift. The new Technomicro Microfiber upper is more forgiving than Lorica, can't be stained or scratched, and includes mesh panels for continuous airflow. Caliper Buckle 2-way ratchet and High Security straps for easy, on-the-fly adjustment.