I had my wife, the Galaxy S4 mini bought, which then required a corresponding sleeve. When researching on Amazon we found this envelope and we must say we are very satisfied with the processing. No other smartphone case provides dust protection for the connections of headphones or USB on the device, and if you have a dust protection extra purchases, these little plastic plugs lost very quickly.
Unfortunately we realized only at the attachment that the envelope is transparent - mini on a black S4 sees this not so nice. But the above-mentioned reasons make it up for it. The two included screen protectors were playing for us as a selling point also play a role, unfortunately has gone us a broken (had for the first time a film on a smart phone attached).