Abstract: An outsole for an article of footwear can include ribs and nubs to provide traction. Each rib is spaced apart from an adjacent rib and includes a first side segment disposed on a lateral side portion, a second side segment disposed on a medial side portion, a first angled segment, and a second angled segment. The first angled segment extends from first side segment, the second angled segment extends from the second side segment, and the first and second angled segments form a peak directed towards an anterior end of the outsole. Each nub is disposed between two adjacent ribs of the plurality of ribs. The nubs include side nubs and intermediate nubs. The side nubs are disposed between pairs of side segments of the ribs. The intermediate nubs are disposed between pairs of the angled segments of the ribs.

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.