The ActionWrap - Sport Armband is perfect for any athletic activity. The iPhone 4S super fit into the bracelet and with a protective case (used here: Ozaki iCoat 0.4 mm). The bracelet is also to be used for thin women arms, because it is for my girlfriend and she has an arm circumference of 27cm and it fits perfectly, not too loose, not too tight and it also slips nothing while running. Here makes the second "slot" to perform the loop real sense. In addition, the "slots" not just cut into the neoprene, but hard plastic eyes were sewn, so it can not cause damage here. The build quality is high, the edges are all super sewn and around! That's the Velcro allegedly interrupted can not be left unchallenged, there are indeed a few interruptions projects, but which are only 1-2mm wide and serve the elasticity - otherwise it would simply be too rigid! Just as it incomprehensible that there should be problems with the neck of the headphone jack is. Ok, here the cut is not perfectly positioned but it is perfectly possible to pull the soft material a little, and then insert the jack clean, then you have to also worry that the iPhone and / or the headphones (plug) is damaged , All in all, the product is perfect for the sport and for a great price! For me personally, I will order now even one, because I have can not compete with the ActionWrap! Short and sweet: buy recommendation !!!