air pump which is actuated by the foot of the user and receives airthrough air hole 31 the air being compressed by the foot of the user and is directed through tube 33 air cylinder 22 and into support chamber 1 pump 10 is formed from a material such as a plastic polymer which is relatively soft and has a flexible quality to permit it to resume its original shape when pressure from the foot of the user is released therefrom by contrast support chamber 1 is formed from a more rigid material preferably selected from a plastic polymer which permits surround chamber to maintain a preformed three dimensional structure before compressed air is pumped into the interior thereof the amount of compressed air pumped into support chamber 1 by the user determines the degree of firmness desired since support chamber 1 is formed of a more rigid material it maintains itself as a constant three dimensional structure and in this manner always provides stable support for the foot of the user prior to the introduction of compressed air therein thus the cushion system includes a center portion defined by pump 10 that is always softer than a rigid outside portion defined by support chamber 1 whether or not compressed air is introduced into support chamber 1 by pump 10 fig2 shows an alternate form of the present invention according to this form the air cushion comprises a support chamber 1 an air cylinder 22 connected to support chamber 1 at one side thereof a plenum chamber in the form of a pump 10 spaced from the air cylinder 22 at a side opposite to support chamber 1 and a tube 34 forming an air passage.