Footwear outsole having arcuate inner-structure

An outsole for footwear, the outsole comprising a body member having a medial side, a lateral side, an upper surface and a lower surface,

• (a) the upper surface comprising an inner-structure having at least one arcuately shaped transverse channel member extending substantially from said medial side to said lateral side, wherein said at least one arcuately shaped transverse channel member is configured to be spaced approximately below the metatarso-phalangeal joints of a wearer's foot inserted in footwear constructed with said body member;
• and
• (b) the lower surface having structure providing formed areas of flexion to accommodate changes of anatomical position of the metatarsal joint axis of the wearer's foot during normal growth thereof and to permit the outsole to readily flex at areas which correspond to areas of the wearer's foot which normally flex as the foot passes through normal phases of gait, to thereby enhance the wearer's foot comfort.