Hola. Any stretch thin fabric will do. Also, you can choose the color and change a little bit their look. The length of the bass wave is so long, that it will not matter the fabric, but my advise is as thin as possible. I will matters if you are using a very thick fabric to cover a tweeter, or the stat panels. It is not recommended to use any cover when you are listening to the music with stat covers on, but it is very wise to use covers when the speakers are not in use. Happy listening!