Review on Gray Small E Tronic Edge Phone Holder for Running - Reflective Logo Cell Phone Arm Bands - Fits iPhone and Android - Ideal for Running, Walking, Hiking, and Biking by Christopher Jackson

*See upgrade overview below* So I bought this based on positive reviews. I run 4 days a week and use the popular phone band. Unfortunately, sometimes I get uncomfortable chafing even when using anti-chafing products. I bought it to use with my Samsung S8+ (which fits in a pocket but takes effort and maneuvering). I ordered medium based on the bicep size suggestion. Unfortunately, when I ran with it on my arm, it failed. It slid down my arm, crashing my phone onto the bony part of my elbow. I kept pushing him back, but he didn't stay. Based on the positive reviews I believe if you order the right size it will work. I'd suggest preparing for some maneuvering if you have to fit a large phone in your pocket, and maybe ordering a size down if your biceps are almost a size down. UPDATE: Within days of posting my review, I was contacted by E Tronic Edge who offered me a smaller size for free. 2. UPDATE: I received the small band and it works great. Doesn't slip out of my hand anymore. I'm having a little trouble getting my Samsung S8+ into the case, but it fits. It works fine when I take the cover off.