A plurality of fluid-filled chambers may be incorporated into sole structures of articles of footwear. The chambers may be configured to be substantially diamond-shaped. The chambers may lie within cavities formed by a lower surface of the midsole and may extend into apertures in the outsole. The apertures in the outsole may be aligned with the cavities of the midsole. The chambers may be bounded by bounding regions between and at the perimeter of the chambers. The bounding regions may be formed of a polymer foam material of the midsole. The chambers may additionally be connected.

A sole structure for an article of footwear can include auxetic openings and sipes. The auxetic openings and sipes may be applied in a regional manner to achieve different characteristics for the sole structure in the different regions.

An article of footwear including a sole structure attached to an upper defining an internal void configured to receive a foot of a wearer is described. The sole structure includes a sole body portion having a central sensory node element located in an aperture in the sole body portion. The central sensory node element has a bottom surface configured to contact the ground and move vertically within the aperture. The movement of the central sensory node element pushes a top surface of the sensory node element attached to a portion of the upper against the foot of the wearer. The central sensory node element is arranged approximately centrally between lateral and medial sides and between the toe and heel ends of the sole structure. The central sensory node element acts as a home button to provide sensory feedback about movement and direction of forces to the foot of the wearer.

An article of footwear may have an upper and a sole structure secured to the upper. The sole structure has a plurality of support elements, and each of the support elements include a shell and a core. The shell defines an interior void and is formed from a polymer material that extends around substantially all of the void. The core has a shape of the void and is located within the void, with at least a portion of the core being a polymer foam material. The polymer foam material of at least two of the support elements may have different densities.

A futuristic shoe with true energy return based on enhanced heel-lift, optimized shoe springs (40% reduction in maximum foot impact), practical precise automatic electronic gear changers, novel powerful shoe impact chargers, improved pulley electronic actuators, novel low-impact much stronger springs (featuring the novel use materials such as Kevlar, Spectra Shield, and fiberglass), novel remarkably stronger, more flexible, and tougher structures, and multiple designs for enhanced heel-lift and to prevent excessive toe sink. These designs require linkages and two improved hingesone with enhanced natural hinges and a second with tied cogged hinges. There is a rotating-arms enhanced optimal spring, which when combined with the tied cogged hinges, results in optimal foldable arrays for deployment in outer spaceand which gives a smart energy return knee brace. These novel capabilities promise a wide range of additional applications such as robotics, prosthetics, orthotics, springs, aerospace, automobiles, body armor, and earthquake retrofitting.

A sole structure for an article of footwear is provided. The sole structure includes an outsole having a ground-engaging surface and an upper surface formed on an opposite side of the outsole than the ground-engaging surface. A first cushion is disposed proximate to a medial side of the sole structure and includes a first fluid-filled chamber attached to the upper surface of the outsole and a second fluid-filled chamber attached to the first fluid-filled chamber and disposed between the first fluid-filled chamber and the upper. A second cushion is disposed proximate to a lateral side of the sole structure and includes a third fluid-filled chamber attached to the upper surface of the outsole and a fourth fluid-filled chamber attached to the third fluid-filled chamber and disposed between the third fluid-filled chamber and the upper. The second cushion is fluidly isolated from the first cushion.

An article of footwear includes a sole having a lower surface, and a reactive element disposed on the lower surface of the sole. The reactive element has an exposed surface, and the reactive element is configured to transition the exposed surface between a first state and a second state in response to a compression force applied to the reactive element by an external ground surface in a user activity, to prevent accumulation of ground surface material, such as mud, dirt, clay, sand, slush, etc., compacting on the sole of the article of footwear in the user activity. The reactive element may include an elastomeric dome shaped popper that compresses flat in response to a compression force and then pops back to a non-compressed state in response to release of the compression force.

A sole includes an upper sole portion having a region and a toe region, and a pod assembly disposed below the upper sole portion. The pod assembly includes at least five pods fluidly connected in a substantially linear arrangement extending from the heel region to the toe region. The pods are fluidly connected in series.

A plurality of orthotic systems are provided. One bi-layer system is constructed from a single sheet of fabric that is molded into two layers. One tri-layer system includes a base layer; a mid-layer; and an upper layer. The upper layer is joined to the mid-layer and the mid-layer is joined to the base layer. The coupling of the base layer, the mid-layer and the upper layer create a rear spring section, a mid-spring section and a front spring section in which the upper layer is suspended over the mid-layer and the heel portion is suspended on the proximal heel end of the base layer.

An article of footwear including a sole structure attached to an upper defining an internal void configured to receive a foot of a wearer is described. The sole structure includes a sole body portion having a plurality of sensory node elements located in apertures in the sole body portion. The sensory node elements have a bottom surface configured to contact the ground and move vertically within the apertures. The movement of sensory node element pushes a top surface of the sensory node element attached to a portion of the upper against the foot of the wearer. The sensory node element provides sensory feedback to the foot of the wearer about the condition of the ground. The sensory node elements are arranged along perimeter edges of the sole structure to provide sensory feedback along the peripheral boundaries of the foot of the wearer.