I bought AKG K-240 headphones for studio purposes. Those are very comfortable to use, but the plastic material covering makes the skin sweaty after couple of hours spend on the head. Then velour pads are perfect solution for comfort of studio work.
They are easy replaceable, although you have to be careful not to tear, as the back plastic material covering is much shorter than the one on factory pads. The pads are build of very comfortable soft velour mesh pad. Looks like it will not wear out within a month. It is good quality. Headphone ear cups stay perfectly on the ears, I would say, fit little better than original one.
They muffle the sound slightly more efficient then original pads.