a replaceable shoe sole is comprised of a mid - sole , which is securely attached to the upper portion of the shoe , and an out - sole removeably attached to the mid - sole . the upper surface of the out - sole is provided with a continuous ridge which is snapped into a matching , deformably resilient groove recessed into the bottom surface of the mid - sole . the configuration of the ridge and the resiliency of the out - sole and the mid - sole material , which is preferably a polyurethane resin or foam , permits the out - sole to be easily and selectively removed and replaced by an out - sole having a new or distinctive tread pattern , the replaced out - sole being reusable if desired . the ridge on the out - sole is provided with an undercut portion to provide secure retention of the out - sole in the mid - sole , although the specific cross sectional shape of the ridge may vary depending upon the retentiveness required by a particular activity .