The Mirage is minimal, lightweight, incredibly responsive and also provides just a touch of guidance for the neutral to slight overpronator, allowing the feet to move through the gait cycle unrestricted. Strategically placed memoy foam in the heel provides a heel pocket for a snug fit. High rubber compound increases cushioning and step in comfort. Heel progrid lite is the lightest version of progrid, 20% more responsive than EVA and continues to provide great cushioning. High abrasion EVA is extremely lightweight keeping you cushioned whilst staying durable. Blown rubber outsole is a lightweight, flexible material that provides added cushioning while maintaining durability and a smooth ride. The XT900 carbon rubber outsole material that also offers exceptional traction properties without sacrificing durability.