My Galaxy Note 5 fits perfectly in a bracelet with or without a case. (wavelength fallology). I was able to use the headphone jack without any problems. I ended up removing the case and using it without the case because after wearing it for a while it weighed more than it needed on my arm. I was able to use the touchscreen without any problems. Changing the volume was a bit fiddly as there isn't a dedicated hole for the volume buttons so you just have to grope it through the fabric. But it's easy enough to do. (If I had headphones with a volume control on the cord, this would be an easy workaround.) I found that sweat had seeped into the bracelet and I can see how if you get really crazy exercising you could be concerned, that sweat occurs on the phone. In this case I think a small piece of felt (or other fabric) placed inside the case between the back of the phone and the back of the strap will solve all the problems. (And weighs a lot less than any actual case.) I'm new to using armbands at the gym, so it took me a while to figure out how to strap my phone to my arm without cutting off circulation. In terms of width, I'm a relatively small person (5ft tall) and the strap worked great for me on the "smaller" settings. If you were much skinnier than me you might find that it's still a bit wide for your hand.
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