Mesh Upper with Targeted Support Zones: Breathable design for comfort and support Cushioned Midsole: Cushlon 3.0 foam with Zoom Air unit in the forefoot for stability and impact absorption Durable Outsole: Waffle outsole for grip and stability Enhanced Arch Support: Midfoot support system to control pronation and provide extra support Offering stability where it's needed and cushioning where desired, the Structure 25 supports you through long runs, short training sessions, and even quick outings. It's the stability you've been looking for, reliable from the first wear, with a fully supportive midfoot system and enhanced cushioning.