Abstract: A footwear sole includes a first sole component or an inner portion of the sole and a second sole component or an outer portion of the sole. The upper surface of the first sole component having an undulating pattern of crests and troughs that is out of phase with a lower surface of the first sole component having an undulating pattern of crests and troughs. The vertical alignments of the crests of the upper surface with the troughs of the lower surface are configured to apply pressure at specific locations of the user's foot. The second sole component has a lower surface with an undulating pattern of crests and troughs that is out of phase with that of the lower surface. The combined configuration imparts differential pressure and sensory stimulation to the bottom surface of the user's foot.

Abstract: An article of footwear having an upper constructed at least in part from a sock-like structure having at least two or more layers in a portion of, or in all of, its regions. The sock-like structure may be knitted and may be a unitary construction such that one portion folds over another portion. Separately formed attachments may include parts of the sole, liners, decorative elements, cording, and structural supports which may be located between the layers of the sock-like structure. The attachments may be molded and conformed into shape directly on to the sock-like structure.