FLEXIBLE SOLE FOR ARTICLE OF FOOTWEAR

A sole structure for an article of footwear comprises a midsole coupled to an outsole. The midsole comprises a plurality of sipes on a first side and a plurality of sipes on a second side opposite the first side. The sipes partition portions of the midsole body into impact attenuation cells on the first and second sides of the midsole. The second side of the midsole further comprises a plurality of grooves and a plurality of protruding members separated by the grooves. The protruding members extend from a midsole body towards the outsole when the midsole is coupled to the outsole, spacing the midsole body apart from the outsole. When coupled together, the midsole and the outsole form voids at the grooves. The grooves, protruding members, and sipes provide increased flexibility to the midsole even when the midsole is coupled to the outsole.