running Shoes Sidi Alba for woman with upper in Politex, closure Soft Instep 3 and Tecno 3 System, and sole Millennium 4 Carbon Composite Sole of carbon fiber injected into a Nylon matrix.;Characteristics;- Locking System Soft Instep 3 Closure System;The strip of closure, wide, anatomical and padded, is made of a soft material thermoformed for comfort and performance. Distributes pressure evenly over the arch area of the foot, adjusting for both sides for perfect centering. The Soft Instep 3 Closure System is durable and replaceable.;- System Tecno 3 System;New dial Sidi Techno 3 in the upper for an optimum fit and personalized.;- Heel Sidi Replaceable Heel Cup;The heel replaceable polyurethane non-skid keeps the foot in position and avoids the shoe being deformed due to extreme use or prolonged pressure.;- Sole Millenium 4 Carbon Composite Sole;The sole Millennium 4 Carbon Composite Sole is an evolution of the soleplate Millenium 3. By reinforcing the sole with carbon fiber, the designers of Sidi have created a sole that improves on the technical characteristics of the previous Nylon sole. The sole Millenium 4 is composed of carbon fiber injected into a Nylon matrix. The sole Millenium 4 includes a heel replaceable polyurethane non-slip. It is compatible with most pedals on the market without the need of using adapters.