Ambos tienen esta peculiaridad (Razón por la que me decidí por uno de ellos y no por los Bose QC35), pero para mi gusto, en el caso de los Sennheiser funciona mejor, ya que con los Sony tienes que tapar el panel derecho con la palma de la mano, mientras que con los Sennheiser te basta con un doble toque en el panel. I actually ripped off a piece of the box they came in and used it as my template to mark the holes - see in the pic haha. As soon as I opened the box I knew that wasnt the case, these feel amazing on my head! I purchased for pregnant lady with swelling in feet. Toe and crystal foot straps material like previous models prior to memory foam upper. Perfect for winter mornings when he goes to the gym before changing into gym clothes and great for lounging. I did some research and saw another person said the same thing. doing remodeling or working around the garage etc and want pandora etc you can hear from about anywhere in the house this is the easy way to do it. THE MOST COMFORTABLE PAIR OF FLIP FLOPS I OWN. The first thing I noticed was how stiff they were.