Patent ID: 8881431

Claim:
A shoe that extends in a longitudinal direction between a heel region and a forefoot region of the shoe and in a transverse direction between a medial side and a lateral side of the shoe, the shoe comprising: (a) an upper; (b) a first sole portion, said first sole portion including: (i) a bottom surface; and (ii) a plurality of recesses which are recessed from the bottom surface; and (c) a second sole portion, said second sole portion including: (i) a plurality of securing portions which are secured in the recesses of the first sole portion; and (ii) a plurality of tread members extending between adjacent securing portions, wherein each tread member includes an inner surface and an outer surface, the inner surface at least partially defining a cavity within the shoe and the outer surface at least partially defining a ground contacting surface of the shoe, and wherein each cavity extends between a first opening facing towards a medial direction of the shoe and a second opening facing towards a lateral direction of the shoe such that the ends of the cavity are open to outside of the shoe.