Patent ID: 8479417

Claim:
An article of footwear, comprising: a sole including a midsole and an outsole, the outsole configured to contact a ground surface; the midsole including a first sidewall and a second sidewall, the first sidewall and the second sidewall being located on opposite sides of the article of footwear; the first sidewall including one or more sidewall grooves; the second sidewall including a plurality of sidewall grooves; the first sidewall being asymmetric with the second sidewall in regards to the plurality of sidewall grooves in the second sidewall; at least one sidewall groove in the second sidewall being longitudinally misaligned with each sidewall groove in the first sidewall; and wherein the plurality of sidewall grooves in the second sidewall increases the flexibility of the second sidewall over the first sidewall; wherein the second set of sidewall grooves are disposed on a medial portion of the heel region; and the first sidewall includes fewer sidewall grooves than the second sidewall.