I bought this to use with my Sport Armband HTC after months of putting up with a traditional iPod armband (Which the HTC did not fit into well). I was so excited to use it today after the terrible spell of cold weather we had been having cleared a bit, but was very disappointed When I went to put it on. Because of the temperature outside what I wear a polyester-based running shirt. When I went to put the strap on, it immediately slid down my arm Because The strap material is so smooth. I am a petite woman, but by No Means stick-thin and the bracelet at it's tightest just managed to keep my phone from falling down my arm. With the addition of the slippery material, it dropped right down my arm to the floor.
Totally disappointing !! I'm hoping That with summer weather and tank tops this will function better, but for now I'll have to stick with my old iPod holder.