The 2012 Fischer RC4 11 Freeflex binding is designed for ski racing. The Freeflex has a DIN from 3 to 11 is strong and made to go on Fischer RC4 World Cup Race Skis. The Fischer RC4 Freeflex Z11 Ski binding has a full diagonal toe and heels, rollers in the toe and a rotating AFD to provide one of the safest race bindings you can buy. It helps smooth out the flex of the skis.