A durable, lightweight shock absorbing shoe sole having an upper sole and a bottom sole attached to the bottom of the upper sole and including a plurality of inverted cups within the bottom sole and penetrating into the upper sole. At least one of the inverted cups being of a preselected configuration...http://www.google.es/patents/US5653046?utm_source=gb-gplus-sharePatente US5653046 - Durable, lightweight shock resistant shoe sole
