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The Northwave Extreme Tech SBS shoes combine the most advanced design and cutting edge technology to produce the lightest, stiffest and fastest shoe on the market. The all new Ultralight Carbon sole utilizes a new airflow system that ventilates the shoe, and a Speedplay specific adapter system allows an even thinner stack height while allowing usage of all major pedal systems, making this the most adaptive high performance road shoe available. An entirely seamless upper allows a precise fit and no overlapping materials. Ventilation windows and perforations give the Extreme Tech its breathability and cooling. The unique Speed Lace Winch cable system provides precise forefoot adjustment through a cable lace and a side button that is very intuitive and easy to use. The side button gradually releases the cable so you can enjoy micrometric control while riding. The instep fit is controlled with the proven A.S.R. retention system, featuring the Step By Step buckle which allows micrometric opening and closing of the system. Available in 40-47 with half sizes from 42.5-45.5. White/black.