The protective cover comes in a matching package which God is good thanks to open.
The mobile phone is (foolproof) simply hineingeklippst. The cover fits like a second skin. The edge of the envelope on screen is a little out, so that you do not have to get scratches on the display surfaces of fear because the screen does not touch the table (or similar and so).
The proof of the pudding with dropping down the phone, I have not done, because a failure would have expensive consequences, but I am sure that serious damage would be turned away from the phone through the shell.
The sleeve holds good, it is not rubberized (thank goodness, because who wants the whole day a Klopümpel touch), but it is by a little more slippery than the competition (from a private house of Mumbi).
I can only recommend the sleeve. Heartily.