The insert has two leaf spring sets (2,3) with one set (3) projecting the length of the foot and the other shaped in a 'C' supporting the heel. The spring sets are made form two leaf spring elements (5,6:9,10) which are arranged adjacent to each other. Both end areas (A,B) of the foot spring set (3) are connected together and between the end areas is a separation piece (7). A distance spacer (8) is provided to maintain the separation between the foot spring set elements and an elastic pressure cushion (11) is also provided, which is connected to and air pump (12) which is activated when the heel is depressed.
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