A removable cleat for a shoe is described. The cleat includes a ground-engaging structure for engaging the ground. An attachment structure is for removably attaching the cleat to the footwear. The attachment structure has a vertical axis, a base to which the top of the ground-engaging member is attached,...http://www.google.es/patents/US6463681?utm_source=gb-gplus-sharePatente US6463681 - Method of using removable cleat system
