The MILLENNIUM 4 CARBON COMPOSITE SOLE features injected carbon fiber in a matrix of Nylon, providing more rigidity than a standard nylon sole. The MILLENNIUM 4 CARBON COMPOSITE Sole is also more durable, completely non water-absorbent and mechanically stable, meaning it’s less susceptible to changes in stiffness resulting from aging, prolonged usage, and changes in temperature or humidity. An anti-slip toe insert and replaceable polyurethane heel pad are incorporated into the MILLENNIUM 4 CARBON COMPOSITE Sole, for walkability. The MILLENNIUM 4 CARBON COMPOSITE Sole uses a standard 3-hole drilling pattern for compatibility with the best pedal systems available, and includes a printed 10 mm lateral and fore/aft cleat alignment scale on the sole for easy cleat alignment and replacement.