With a flexibility which is hard to match, the shoes are great for the avid runner. They come with an aggressive outsole with angled grooves, which are different from the classic horizontal grooves. In terms of propulsion, this proves to be a great solution and it makes the shoes a good choice for speed. This means that the shoes also come with a hard cushioning which favors the runner who loves top speeds. With a stretchy upper, they also feel comfortable for long runs as well. In terms of design, I like the color options which really give them a quite modern when compared to other Brooks shoes.