Abstract: An article of footwear includes a footwear upper, a sole structure, and a bistable compliant device having at least one arm with an anchor end anchored to the sole structure, and a posterior portion remote from the sole structure and further rearward than the anchor end. The device extends around a rear of the foot-receiving cavity and has a first stable resting state with the posterior portion in a first position and a second stable resting state with the posterior portion in a second position closer to the sole structure. The upper is secured to the device at the rear of the heel region.