I have bought this cover for my mac book air 13" and I'm satisfied with it because it protects the laptop from scratches and blows. The cover is composed of two parts. The upper one, shields the entire top but, being the colour a light violet, it's visible the Apple's logo under it. The other part covers the bottom of the mac book and it's very practical because it has four feet at the extremities that, with the chinks in this part of the cover, help to keep the temperature of the mac low.
The only con is that the cover even if it's slim, makes inevitably the laptop thicker in particular in the frontal view. Even so the cover is extremely light and so it doesn't alter the weight of the mac book.