I bought this iphone armband a year ago when I had a HTC Hero. Fit that thing perfectly. Then when I got the Optimus they are the same size. I absolutely love this armband. Best $10 I ever spent on a phone. With this one you have full access to the buttons, earphone and touchscreen. Made of a neoprene like material.
Here is the link to the ebay seller For iPhone 3G S 3GS ArmBand Sport GYM Case iPod i Touch | eBay
By the way. My boss paid almost $30 for his armband at Best Buy and I think mine is way better.
Depending on how big your forearms are this will fit and tighten down on a forearm. Its a bit tricky but it works. The company also has other things available on their website that might be more along your needs. This is also the armband I spoke of earlier. The biggest drawback is the plastic is very think and the Optimus V screen doesnt respond well.I was looking for a similar item but for the forearm. Kinda like the pipboy from fallout3 but with the ability to also be place on the inside of the forearm. Any of the ones I have found in stores locally for the bicep cant be made tight enough for the forearm so it makes me apprehensive to order anything online without atleast some kind of review from a user referring to the same application of the product and it working.
From the pic it looks like it is for a flip style phone and might not fit the OV but tells us when u get it how it fits and maybe add some pics of it with the phone in it. Please.
Got the Arm Band in today and not only does the OpV fit, it fits while its still inside the Otterbox Case, Fits rather nicely I might add. No jamming it in, it just slides in like it was made for the OpV.