A toe piece for a gliding apparatus, such as a touring ski, including two tightening elements relatively movable between a boot-tightened position, in which they engage respective lateral housings of the boot, and an open position to release the boot, the tightening elements forming a pivot axis for the boot and a stop movable between an active position in which the stop comes into contact with the front end of the boot so as to longitudinally position the lateral housings of the boot, and a retracted position in which the stop does not interfere with normal pivoting of the boot during an ascent phase, the stop being in an active position when the two tightening elements are in the open position and the movable stop is directly connected to the tightening elements, so that a relative displacement of the tightening elements causes the stop to switch between its active and retracted positions.