Patent ID: 7036245

Claim:
A sole construction, comprising: a plurality of stretchable layers spaced apart from one another, wherein the plurality of stretchable layers have a first side and a second side; a plurality of actuators, each actuator positioned on the first side of at least one of a corresponding stretchable layer; a plurality of chambers, each chamber being positioned on the second side of the a corresponding stretchable layer; and a plurality of perimeter walls, each perimeter wall surrounding a corresponding stretchable layer to prevent horizontal displacement of said layer when the actuator is compressed against the layer into a corresponding chamber; wherein each stretchable layer has raised walls; wherein the raised walls are on the first side of the stretchable layer; and wherein the raised walls are shaped to correspond with an outer border of a corresponding actuator to guide the actuator against the stretchable layer and to minimize horizontal displacement of the stretchable layer when the actuator is compressed against the stretchable layer into a corresponding chamber.