Patent ID: 7596888

Claim:
A shoe comprising: a medial side, a lateral side, a front, a back, and a rear sole; an upper having a front, a back, a forward region, a heel region, a midfoot region located between the forward region and the heel region, an interior, a medial side, a lateral side, and a mid-longitudinal axis, the heel region of the upper having a medial side, a lateral side, a rear, a vertical central axis, and a width as measured between a portion of the medial side of the heel region of the upper and a portion of the lateral side of the heel region of the upper in a direction approximately perpendicular to the mid-longitudinal axis of the upper and the vertical central axis of the heel region of the upper; a flexible plate having an upper surface, a lower surface, an interior portion and peripheral portions, the flexible plate being positioned between at least a portion of the rear sole and at least a portion of the heel region of the upper, the peripheral portions being restrained from movement in a substantially vertical direction relative to the interior portion at a point proximate the medial side of the shoe and at a point proximate the lateral side of the shoe, the interior portion capable of being deflected relative to the peripheral portions in a substantially vertical direction, the interior portion being positioned above a void, the void having a width as measured in a direction approximately perpendicular to the mid-longitudinal axis of the upper and the vertical central axis of the heel region of the upper, the width of the void being greater than one-half the width of the heel region of the upper; and at least one substantially air-tight enclosure positioned between at least a portion of the rear sole and at least a portion of the flexible plate.