Sidi's Spider SRS Carbon Technomicro Shoes offer awesome power transfer and support and they're almost as comfy as your bedroom slippers. The entire upper is comprised of tough, breathable Technomicro for a secure yet supple feel and they have stiff Sidi Carbon Composite SRS soles that ensure all your power hits the pedals. You also get Sidi's Caliper buckles that let you dial in the fit even while riding, Sidi's High Security Velcro straps that stay tight, and their Soft Instep Closures that eliminate pressure points. These sweet shoes even have ventilated heels to keep your feet cool on hot days and Sidi's integrated rubber toe guards and SRS system that increase the life of the shoes even if you walk/run in them. Is it any wonder the Spiders are so popular with cyclocross racers?