The toe-piece (100) of a ski mountaineering binding comprises: a first jaw (1) and a second jaw rotatably coupled with a base (B) fixable to a ski (S); a first hooking element (10) borne by the first jaw (1) and having a first tip (11) for inserting in a first lateral hole (F1) of the front part (A) of a ski boot (D) for ski mountaineering and a second hooking element (20) borne by the second jaw (2) and having a second tip (21) for inserting in a second lateral hole (F2) of the front part (A) of the ski boot (D) for ski mountaineering when the toe-piece assumes a configuration (O1) of an inserted ski boot.
The toe-piece is configured in such a way that at least the first hooking element (10) is inserted in a first seat (12) present in the first jaw (1) with the first tip (11) exiting from the first seat (12) and in such a way as to be able to perform a roto-translatory motion between a retracted position (PR), when the ski boot (D) for ski mountaineering is aligned to the longitudinal axis of the ski (S), and an advanced position (PA) of a plurality of possible advanced positions in which it is more greatly projecting from the first seat (12) when the ski boot (D) for ski mountaineering temporarily misaligns with respect to the longitudinal axis of the ski (S).