The gap inside the square portion that locks-onto the rack was just a little wide. Ill keep messing around with my Sound Blaster settings to see if I can get something to work better, but for now, theyre just a tiny little headset Ill use for sound in games and non-music programs. They fit perfectly on my feet. I would say this would fit any size shoe up to maybe a 14. There is something about the way these are fitted to the foot that isnt right. I am a 38DD The PC cord is plenty long (has to attach to the headset->3. Mine had the plastic indicator seal pop the first recharge. In the rear port it has a 3. I ordered a 3xl.