I waited for my first real shock to post a comment. The hull gets into two parts, one that is located on the back of the phone, and the balance which allows clip protection. Easy to take the Iphone (4) in hand, no genes. The time has come for his first shock: so he was placed on a piece of furniture that I thought stable height of 95 cm. I found my naked iphone, back ground; hull separated from her and she had no scratches. Therefore, I fear that this shell is effective for only one shock .. and not a shock like "stairs".
Contrary to what some say, one can easily remove the hull iphone .. This is why the latter can be removed in case of impact.