Scosche iPod Nano 6th Generation Gen Adjustable Workout Sports Armband and Protective Skin Combo
First off, this was exactly what I was looking for.  I just wanted something small and discreet to hold my nano while I worked out.  I wanted something comfortable that wouldn't dig into my arm.  The armband IS comfortable, BUT...it barely fits my arm.  The description says that it fits small to large arms.  I am 6'1\\", 210#, and fairly solid.  My arms are only about 16\\" and there is barely enough strap to velcro together without it cutting off circulation.  I wear it just below my bicep for longer perio