There are many brands but the one I use is listed on Amazon as the Ugreen headphone splitter. They are much heavier, sole is really stiff, very large to the front and narrow in the middle. Not my first Bose product, and I am extremely disappointed. With the ATH-SR6BTs, the Bluetooth connectivity worked great (I even went to a different floor of my house and barely had any interference). they fit perfectly. bei diesem Schuh muss man eine NR. So I wouldnt put too much weight on them or anything sharp like some high heals?Most shoes fit well. These are one of the best . Not great for use when I?m moving around a lot. PROS:- The sound is great!