Ski-touring boot comprising a shell (10), a toe (20) provided with a hole (32) on each side for engagement with a corresponding pin (52) of ski bindings (50,51) and a sole (11), comprising means (30) for guiding and actuating said pins (52) comprising a frusto-pyramidal seat (31), the larger base of which forms the bottom part (31a) open below the sole (11) and the sides (31b,31c) of which extending in the transverse direction (Y-Y) are inclined towards the inside of the seat (31) so as to form elements for guiding the pin (52) in the vertical direction (Z-Z) and the surface (31d) of which situated inside the boot is inclined upwards and outwards so as to form the element for performing opening in the transverse direction (Y-Y) of the said pins (52).