I am gradually increasing distance in my Luna sandals. Even though I am used to low drops and zero drops, this 4K almost made my leg cramp at the end. Nothing that a good foam roll won’t fix, but I won’t risk any injuries. I ran on some technical trails and wow the grip is great! It is very dry now but I suspect that they will impress me on muddy days too. Well, off to foam rolling and re-hydrating (it is 30 and sun, a bit over my comfort).