The device comprises a settable elastic U-like link element (3) housed in a receiving seat (1) defined in the rear cuff (2) of the ski boot and coupled to an engagement element (3b) protruding from the seat (1) and adapted to engage, with the rear cuff (2) in the closed position, with a retaining element (20) provided rearwardly on the shell (21) of the ski boot.
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