Sidi's Five Carbon Shoes are specifically engineered with comfort and efficiency in mind. The supple Technomicro uppers are durable, breathable, and tougher than leather. And, Sidi's Soft Instep Closure Straps, Caliper Buckles and High Security Velcro straps offer easy adjustment and a custom fit, while the padded tongues maximize your comfort. Plus, the layered 3k weave carbon of Sidi's Eleven soles delivers awesome power transfer. Get the Five Carbons and your feet will thank you for years to come.