Released in September 2016, the women's Air Zoom Structure 20 has made significant advancements in stability compared to its predecessors, while still honoring its heritage. The 'Lava Glow' shoe retains the effective engineered mesh upper but introduces a modification by replacing five Flywire cables with two, ensuring enhanced support in critical areas. To address over-pronation concerns among runners, the shoe incorporates a dual-density foam midsole that offers a firmer support on the medial side and a more cushioned feel on the lateral side. This thoughtful design approach enables an optimal running experience while maintaining a focus on stability.