Abstract: A method of forming an article of footwear to fit a predetermined foot is provided by modifying the shape of such an article in which the foot is readily engageable by in-situ formation of a resilient foam moulding in the free space between the article and foot. The moulding is preferably reinforced to resist abrasion during subsequent use, and this suitably involves the location of a woven or knitted resilient sock on the foot for impregnation by the moulding material. Also the moulding can bond spontaneously to the article. The moulding is preferably permeable, and need not fill the free space between the foot and article, but can be restricted by suitable location of inserts. The method is particularly suited to situations where the foot is abnormal.