They dont block much sound from the outside when you have the volume turned down which is nice if you need to listen for others possibly talking to you. The instructions clearly said 16". The design is so beautiful and its sleek plastic not matte. I am somewhere between a 9. Materiali di ottima qualità e piacevole al tatto, aderisce perfettamente, led di ricarica visibile. The sound quality is great & charge lasts for ages. These shoes are cute, classy, and go with everything from jeans to dresses. pretty bad fit on the head as well. I have a fairly narrow foot, and the narrow is not very narrow - so if you are a medium width, I would not suggest going to a wide width as someone else suggested. The black color looks very black, but does seem like it will fade over time.