Keep your feet warm and dry and continue riding in any weather with the Sidi Zero Gore Gore-Tex. The GORE-TEX® membrane is at the heart of all products engineered with GORE-TEX® fabrics. It contains over 1.4 billion microscopic pores per square cm (9 billion pores per square inch). These pores are 20,000 times smaller than a water droplet, but 700 times larger than a water vapor molecule. Water from the outside will never penetrate. Yet perspiration can escape easily, so that less moisture is trapped in the insulation. The result: you stay warmer when it’s cold and drier when you perspire. Sidi Heel Cup Reinforced cup that stabilizes and supports the heel. Anatomically shaped plastic, reduces heel slip and provides increased power transfer. Provides additional foot protection in the event of a crash. Replaceable Heel Pad For walkability, Sidi cycling shoes include a replaceable polyurethane heel pad. Millenium 5 Sole The redesigned MILLENNIUM 5 SOLE is constructed from injected carbon fibre in a nylon matrix. This infusion of carbon fibre in the nylon increases sole stiffness and durability, ensuring optimum performance in the face of prolonged use and temperature changes. Microfibre Microtech MICROFIBRE MICROTECH incorporates features of resistancy, stability, lightness, transpirability, water-repellency and ecofriendliness. It is manufactured using the “Water-Tech” water treatment. Lower environmental impact, less noxious emissions into the air and into the work environment and the fact that not solvents, but water-based products were used, is beneficial to the environment as well as the final user.