A HUMAN NECESSITIES
A43 FOOTWEAR
A43B CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
A43B13/00 Soles; Sole-and-heel integral units
A43B13/14 characterised by the constructive form
A43B13/18 Resilient soles
A43B13/181 Resiliency achieved by the structure of the sole
A43B13/186 Differential cushioning region, e.g. cushioning located under the ball of the foot