Patent ID: 7100307

Claim:
An article of footwear comprising: an upper for covering of a wearer's foot; a midsole/outsole secured to said upper for covering a sole of said wearer's foot and having an inside face adjacent said sole and an outside face for interfacing with an underlying surface; said midsole/outsole having a region of enhanced flexibility corresponding to a metatarsal region of a person's foot defined by a medial posterior boundary not less than 70% of the length of said midsole/outsole, a medial anterior boundary not more than 80% of the length of said midsole/outsole a lateral anterior boundary not more than 70% of the length of said midsole/outsole and a lateral posterior boundary not more than 60% of the length of said midsole/outsole; and said midsole/outsole has a heel region corresponding with a wearer's heel and a convex curvature to said outer face in said heel region; said convex curvature has a radius of curvature approximately coincident with a long axis of rotation of said wearer's foot and with a sagittal plane centre of mass of a calcaneus of said wearer's foot.