Abstract: A prosthetic foot keel comprising: (a) a generally S-shaped unitary spatula, defining a main forefoot leg, a rear leg, and an intermediate leg integrally joining the forefoot and rear legs; and (b) a generally C-shape heel, defining a top heel plate, a bottom heel plate, and an intermediate heel plate transversely integrally interconnecting the top and bottom heel plates; wherein said top heel plate is fixedly anchored against the underface of the spatula rear leg. A generally open pocket is defined by the heel and by the spatula intermediate and rear legs. The pocket opens both rearwardly of the foot keel and laterally outwardly thereof on the side opposite the intermediate heel part. The shape of the open pocket is resiliently deformable responsively to the cyclical loads sustained by the spatula forefoot leg and bottom heel plate during the wearer's gait.