Poppajoe
There are two types of carpet commonly used in theatres
The first is woven wool axminsters, made in England or New Zealand, and used in all the older grand theatres. For ten years we used axminsters exclusively for Cineplex Odeon. Now, the whole industry has pretty much gone to printed nylon carpets. The two major American manufacturers are Durkan and Milliken. Advantages are they are dimensionally stable (i.e. mildew and rot resistant)and won't stretch when cleaned. The come with an integral backing, so do not need any underlay (or mating as you call it). Zillions of colours and patterns are available, and you can custom colour any of their existing designs.
We have links to both companies on our web site
www.mesbursmith.com on our links page. We have used both companie's products extensively here and abroad, with excellent results.