The present invention relates to: - a shoe attachment system (C) on a ski touring board comprising, on the one hand, a front stop comprising a base (E) fixed to the board and wedging means (K) and clamping means (S) of the front part of the boot (C) and secondly means for supporting the rear part of the boot comprising a beam (1) articulated on the base (E) and supporting, together, a displaceable carriage (2) provided with locking means and a heel piece (3) connected to said carriage by an elastic return element (5) and sliding axially on said beam (1) while being supported behind the heel of the shoe (C), characterized in that said heel piece (3) comprises a rear stop provided with a collar (4) intended to bear against the rear part of the upper of the shoe (C) and having a holding portion (42) and a boot portion (41) and - a running board data equipped with the fixing system.
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