5 size down and now fits perfect. Not sure what causes these issues but happy otherwise. These slippers were somewhat on the snug side. I didnt believe the 1-star reviews and gave it a try and wasted my money. Das ich das noch erleben darf! they ARE comfortable! They forwarded me another pair for free. I have the studio 3 beats and these smash my pads down and also pitch them into a round shape instead of the oval shape they are. No me gusto el porque ni si quiera tiene instructivo. But the sound quality is not good.