I would say that speed is the main point of this shoe! When I opened up on less-technical dirt trail, I found the Hypers to be great. The foam sole was lightweight, but still responsive. I don’t like feeling like I’m wearing bricks on my feet, like some trail shoes feel. These shoes were surprisingly light and felt almost like road racing shoes (aside from the rigid forefoot). While they’re not good on ice or in deep mud, onemix shoes Black I think the Hypers could definitely be worn on a fast dirt trail course under ultra distance. They are great for speed. And they push back when you push off, giving you that extra little “umph” in your step.