Embodiments provide an insole having a multilayered construction with openings and ribs sized, shaped, and positioned to provide desired areas of stiffness and flexibility. The multi-layered construction may include a chassis defining a support member opening and a support member covering the opening and positioned between the chassis and a cushioning layer. The chassis may define a plurality of apertures in the forefoot portion, which, in a direction from the forefoot end to the heel end, progressively increase in size to a point at which maximum flexibility is desired in the forefoot portion. The bottom of the support member may include protruding ribs that extend generally in a longitudinal direction from the midfoot to the heel, and include a straight middle rib, a medial side rib convex with respect to the middle rib, and a lateral side rib convex with respect to the middle rib.