A heel-piece with a heel raiser for ski mountaineering, comprising: at least a first heel raiser which is hinged with respect to a first hinge axis to the heel-piece for rotating into a first position, in which the first heel raiser can restingly receive a heel of a ski boot during ski mountaineering, and for rotating into a second position; characterised in that: it comprises a first element which is magnetic or magnetisable and which is mounted on-board the first heel raiser; it comprises a second element which is magnetic or magnetisable and which is mounted on-board the heel-piece; at least one from between the first element and the second element is magnetic; the first element and the second element are arranged with respect to one another so that when the first heel raiser reaches or is in proximity of the first position and/or the second position, the first element and the second element interact magnetically with one another, giving rise to a first force which acts on the first heel raiser and are arranged flanked along a direction that is parallel to the first hinge axis; the first element is orientated in such a way as to have the axis thereof parallel to the first hinge axis; the second element is orientated in such a way as to have the axis thereof parallel to the first hinge axis; the first element and the second element are arranged with respect to one another so that when the first heel raiser reaches the first position and/or the second position, so that the first element and the second element interact magnetically with one another and give rise to a first force which acts on the first heel raiser, the first element and the second element are facing one another. at least a first heel raiser which is hinged with respect to a first hinge axis to the heel-piece for rotating into a first position, in which the first heel raiser can restingly receive a heel of a ski boot during ski mountaineering, and for rotating into a second position; characterised in that: it comprises a first element which is magnetic or magnetisable and which is mounted on-board the first heel raiser; it comprises a second element which is magnetic or magnetisable and which is mounted on-board the heel-piece; at least one from between the first element and the second element is magnetic; the first element and the second element are arranged with respect to one another so that when the first heel raiser reaches or is in proximity of the first position and/or the second position, the first element and the second element interact magnetically with one another, giving rise to a first force which acts on the first heel raiser and are arranged flanked along a direction that is parallel to the first hinge axis; the first element is orientated in such a way as to have the axis thereof parallel to the first hinge axis; the second element is orientated in such a way as to have the axis thereof parallel to the first hinge axis; the first element and the second element are arranged with respect to one another so that when the first heel raiser reaches the first position and/or the second position, so that the first element and the second element interact magnetically with one another and give rise to a first force which acts on the first heel raiser, the first element and the second element are facing one another. it comprises a first element which is magnetic or magnetisable and which is mounted on-board the first heel raiser; it comprises a second element which is magnetic or magnetisable and which is mounted on-board the heel-piece; at least one from between the first element and the second element is magnetic; the first element and the second element are arranged with respect to one another so that when the first heel raiser reaches or is in proximity of the first position and/or the second position, the first element and the second element interact magnetically with one another, giving rise to a first force which acts on the first heel raiser and are arranged flanked along a direction that is parallel to the first hinge axis; the first element is orientated in such a way as to have the axis thereof parallel to the first hinge axis; the second element is orientated in such a way as to have the axis thereof parallel to the first hinge axis; the first element and the second element are arranged with respect to one another so that when the first heel raiser reaches the first position and/or the second position, so that the first element and the second element interact magnetically with one another and give rise to a first force which acts on the first heel raiser, the first element and the second element are facing one another.