To expand on what Tyll said - 1964 Ears is able to reshell any IEM, turning it into a custom molded unit just for you. The only limitation is that it must be a balanced armature design rather than a dynamic driver.
Got a universal IEM with a sound you love, but you aren't thrilled about the comfort? This would be something to consider.
I have also been impressed with their own designs. They have a "house sound" that is really smooth on top without being too dark or rolled-off. Great for fans of LCD-2, HD650, etc.



