I purchased this based on the other reviews but I do have to say it is a very poorly made product. Pricewise it's a good deal but that's where it stops. Let me point out the issues.
1. The mesh on the fabric is on the inside as well as the outside and it scratches making you itchy while you sweat. Very distracting.
2. The armband has no elastic. Meaning that if you don't tighten it enough it will slip off but if you tighten to much it cuts off circulation. It's impossible to wear while doing arm exercises, you just can't flex because it's too tight but if you loosen it then it slips while lifting. Even when just walking I found myself constantly adjusting it.
3. The velcro design is poor as well. You know how velcro has the soft side and hook side. After you latch the velcro the hook side is facing toward the skin so it scratches you if it's not perfectly centered.
I have to say I do like the design of the pocket because of the snap. It gave me the idea how to fix my existing "Tune Belt". I'm going to write the review on that one after this one.
You can see that one here:
Sport Armband for iPhone 4S Bundled with EX3 Armband Extender (fits iPhone 4, iPhone 4S, iPhone 3G / 3GS)
I gave this two stars because of price and the pocket design, but if you want a good armband try the one above. It does have it's failings also. The only one really being that the pocket is fed from the bottom and isn't fastened in any way. While doing curls the phone would start to slip out since it was at the bottom and the lip would start to peel back. I ended up adding a snap to it so it would stay in.