I use both mat and cloth, depending on the application. There are hundreds of types of cloth, and a fair selection of mat. Mat is *much* cheaper than an Aerospace grade cloth... so it is something that I am experimenting with to achieve a decent weight mat hull that would be less expensive for those individuals that want a stronger boat (mat being stronger) and are less interested in racing.
I keep a complete record of stats on each and every hull produced so I will always be able to go back and retrieve the build sheet from the data plate that is installed in every hull.
I am at present getting caught up on light-weight decks, while at the same time making boats available for sale as they are completed... but primarily I am waiting for the much anticipated arrival of the new mold....which when properly cured will begin an around the clock effort to produce hulls and get one out to everyone that wants one. [|)]
The light-weight pure race hulls are most assuredly all cloth, and very nice cloth indeed, you betcha....