Sidi's Genius Fit are specifically engineered with comfort and efficiency in mind. The supple Technomicro uppers are durable, breathable, and tougher than leather. And, Sidi's Arch Compression Straps, Caliper Buckles and High Security Velcro straps offer easy adjustment and a custom fit, while the padded tongues maximize your comfort. Plus, Sidi's carbon-injected Millennium 4 soles deliver awesome power transfer. Get the Genius Fit Carbons and your feet will thank you for years to come.