A shoe sole is described that provides both cushioning and stability. The sole
has a plurality of layers, including a transition layer which allows relative motion
between the layers adjacent to the transition layer. The relative motion between
the layers of the sole reduces the impact of horizontal shear stresses on the wearer's
feet and ankles. One such transition layer includes pliable material and deformable
holes within the pliable material. Another transition layer includes at least two
rigid plates held together by less rigid grommets or sidewalls. The transition
layer may be disposed beneath the entire shoe or only portions of the shoe, with
either a more conventional sole structure or rigid support members completing the sole.