Abstract: A one-piece outer sole for logging boots is described which includes pointed metal calks received by receptacles in portions of the outersole which are located beneath the ball, arch and heel portions of the wearer's foot. The sole is made of a flexible material; and the receptacles beneath the ball portion of the wearer's foot are aligned in multiple rows each of which is parallel to a line through the metatarsal phalangeal joints of the wearer's foot. The rows are spaced apart a sufficient distance that an uninterrupted, straight, lateral area of the outersole extends between adjacent rows so that the portion of the outersole beneath the ball portion of the wearer's foot is longitudinally flexible along an axis which is normal to the rows.