@@dreiatienza4860 While the Cloud X 4 performs well in terms of comfort and gym running, I have some concerns about the durability of the outsole. Compared to other models like the Cloud Surfer, the outsole of the Cloud X 4 feels less durable and may not last for 500 miles of running. At times, it feels like the material could crack or wear out faster than the more robust Cloud Surfer. This may be something to consider if you're looking for long-term performance.