Not as strong as advertised by the brand online; it's a piece of styrofoam, that's all. Not as soft as I thought based on the reviews, especially in the forefoot so consider hitting the forefoot. I put an extra pillow in and it's better but then tight so a little skinny leg would be best NOT for a heavier person IMHO. I wouldn't endure it on long runs, 10km etc as my legs get tired. Very neutral. But it runs fast and is perfect for 5k and such. Overall a very light shoe. There is no stability at all.