Tuneband for iPod nano 4th Generation, Armband Compatible with Nike+iPod System
I bought this product after purchasing another armband from Nike that I was very unhappy with.  This is a great arm band that works well with the Nike +.  I have rather small arms and have no problem with it fitting snugly around my arm.  Its easy to operate while running and there is never a fear of my ipod slipping out of it.  I would highly recommend this item for anyone that needs a good armband to hold their ipod while running or walking for that matter.