The RC4 Pro MV BOA DYN is a brand new high-performance freeride boot. It features the BOA H+i1 Fit System to give a mirco-adjustable fit, the RC4 ZipFit liner guarantees heel lock and stability within the VACUUM shells, and the CARBONFUSED cuff offers even stiffness and stability. To meet the needs of true freeriders, the integrated Dynafit insert in the toe makes the boot uphill compatible with multi-norm bindings and downhill compatible with all GripWalk bindings. The fixed cuff provides utmost stability and trust to the rear in a way SKI/WALK cuff boots often don't. With this ski you'll be able to send the really big lines.