Lange Junior Boot RS 90 S.C. 2024Power and Precision. The new RS 90 Short Cuff designed for junior racers and women, is the result of our deep understanding foot mechanics, fit, and ski boot behavior. Our new, race developed Dual Core construction supplies incredible energy and flex control for total control through the turn. The new anatomic shell design integrates perfectly with our new thermo formable Dual 3D liner, delivering unparalleled comfort, precision, and power