Engineered mesh uppers provide a snug and stable fit; Roomy toe box allows toes to spread naturally and comfortably; 5mm drop allows you to access natural running with more under-heel cushioning; FKT insole keeps water out, allowing shoes to drain quickly in wet conditions; Zip Foam midsole compound is springier than EVA and offers more rebound over the life of the shoe; Vibram outsole offers unparalleled grip and traction and durability from the leaders in technical outsoles; Gaiter compatible for additional protection from dirt, rocks, and twigs on the trails (sold separately); Best for Trail Running, Race; Stack Height: 33mm (heel) / 28mm (forefoot); Weight: 10.4oz (M9)