The build quality is impeccable and it does not seem as if it would tear at the earliest opportunity somewhere. The previous runs with this bracelet confirm the suspicion that it is secure and it dissolves anything. Below (where there is at the onset of the headphone jack of the iPhone), there is a small hole through which the headphone cable can carry. Also convenient is the Kabemanagement so that long cables not rumbaumelt in the area. For men with muscular upper arms running this bracelet is definitely not suitable. Not because it would not look good on them, no, they would not be able even close the shutter because of the tightly calculated length.
The iPhone has a tight fit in the casing. About the slide is still a small "roof", so if it should start to rain on the road, no water can penetrate or welding. The fixed seat is bought so that there is always something a Gepfriemel to get the iPhone in the shell or can be detached from it. But better so than if the road suddenly pops iPhone on the floor ;-)
All in all I would highly recommend it. Best for people with rather narrow upper arms.