I second this. The only one I found and used that guarantees no sweat makes it to your phone.
My Bicep is 17" and I run/sprint 2-3 times a week. I use the medium sized one and there is a good amount of strap left when I wrap it around my arm.So for those of you with the Arm Pocket, I have a question ...
The Small is for a 7"-11" arm, Medium is 10"-whatever"
I'm in the process of losing weight, and walking 3-5 miles per day. I do eventually want to start jogging again, and want something far more secure than my pocket to put my phone in (but also want to lose a bit more weight first, to make it a bit easier on my knees & ankles). My bicep measures 10.5"-11" ... which puts me right between the two band sizes. Suggestions on what I should get? Should I go with the Small, thinking it'll stretch?
I will say that the adjustability on this is a big draw for me, and being able to leave my phone in the case is also a big plus. I generally only take 1 set of keys with me (front door & mailbox), so I'm eyeing the Aero (for my 5s), but I've not had good luck with arm bands (due to sweat & sizing issues). I currently have the Reebok one that came with the Bose headphones, and it sucks on my short arms; trying to position it just right & get it tight enough is a total PITA. This looks far more up my alley.