Footwear heel spring device

An article of footwear includes a footwear upper defining at least a portion of an ankle opening and including a flexible covering, a sole structure secured to and underlying the footwear upper, and a device including a control bar and a base. The control bar includes a center segment rearward of the ankle opening, a first side arm extending downwardly and forwardly from the center segment at a medial side of the footwear upper, and a second side arm extending downwardly and forwardly from the center segment at a lateral side of the footwear upper. The base is connected to both of the first side arm and the second side arm such that the center segment, the first side arm, the second side arm, and the base define a void therebetween. The flexible covering extends across the void.