Tecno 3: Allows you to close the shoe quickly and easily, adapting the upper part to the shape of the foot. The anatomically molded plastic shell stabilizes and supports the heel and helps transmit more power without dispersion. Sidi cycling shoes are equipped with a non-slip, replaceable, polyurethane insert in the heel to facilitate walking. The Carbon Composite 20 sole is made of nylon and injected with carbon fiber. The result is a light and stiff sole. Made with Microtech Microfiber, a lightweight, breathable, waterproof and ecological material.