A front insert for a ski boot for ski mountaineering, comprising: an anchoring body comprising two heads (10, 20) and having dimensions such that the two heads (10, 20), when the insert is fixed to the ski boot, are positioned at lateral portions of the front part of the ski boot; a first housing, realised in the first head; a second housing, realised in the second head; characterised in that it comprises: a first contact element comprising a first hole; a second contact element comprising a second hole; the first housing and the first contact element are reciprocally realised and conformed in such a way that the first contact element is insertable and positionable in the first housing, so that the first hole is accessible from outside, and so that the first contact element is decouplable and completely extractable from the first housing; the second housing and the second contact element are reciprocally realised and conformed in such a way that the second contact element is insertable and positionable in the second housing, so that the second hole is accessible from outside, and so that the second contact element is decouplable and completely extractable from the second housing; wherein the insert can thus assume a first configuration of use, when the first contact element is inserted and positioned in the first housing and the second contact element is inserted and positioned in the second housing, and a second configuration of non-use and maintenance, when at least one between the first contact element and the second contact element is decoupled and completely extracted from the relative first housing or second housing. an anchoring body comprising two heads (10, 20) and having dimensions such that the two heads (10, 20), when the insert is fixed to the ski boot, are positioned at lateral portions of the front part of the ski boot; a first housing, realised in the first head; a second housing, realised in the second head; characterised in that it comprises: a first contact element comprising a first hole; a second contact element comprising a second hole; the first housing and the first contact element are reciprocally realised and conformed in such a way that the first contact element is insertable and positionable in the first housing, so that the first hole is accessible from outside, and so that the first contact element is decouplable and completely extractable from the first housing; the second housing and the second contact element are reciprocally realised and conformed in such a way that the second contact element is insertable and positionable in the second housing, so that the second hole is accessible from outside, and so that the second contact element is decouplable and completely extractable from the second housing; wherein the insert can thus assume a first configuration of use, when the first contact element is inserted and positioned in the first housing and the second contact element is inserted and positioned in the second housing, and a second configuration of non-use and maintenance, when at least one between the first contact element and the second contact element is decoupled and completely extracted from the relative first housing or second housing. a first contact element comprising a first hole; a second contact element comprising a second hole; the first housing and the first contact element are reciprocally realised and conformed in such a way that the first contact element is insertable and positionable in the first housing, so that the first hole is accessible from outside, and so that the first contact element is decouplable and completely extractable from the first housing; the second housing and the second contact element are reciprocally realised and conformed in such a way that the second contact element is insertable and positionable in the second housing, so that the second hole is accessible from outside, and so that the second contact element is decouplable and completely extractable from the second housing; wherein the insert can thus assume a first configuration of use, when the first contact element is inserted and positioned in the first housing and the second contact element is inserted and positioned in the second housing, and a second configuration of non-use and maintenance, when at least one between the first contact element and the second contact element is decoupled and completely extracted from the relative first housing or second housing.