Nordica Dobermann PRO EDT 100 are ski boots with a medium-narrow last width designed for racing. They're designed to be very stiff with a 100 flex index, offering better energy transmission from the rider's movements. The shell and cuff are made of Polyether, which remains lightweight and is constructed to be stiff or flexible at precise points where needed. The  keeps energy focused on forward momentum, and the Performance Fit liner and footbed molds itself to the shape of the foot for improved responsiveness.