If you mean reptile carpet, I started out with that. You have to have two sets so when you take one out and run it through the washing machine, you can put the other set in. Snakes love to burrow under it and can make fairly permanent tunnels. So you have to be sure your UTH is on a thermostat, because the snake will get right on it. It's difficult to spot clean, and not as natural looking, although aspen isn't exactly natural looking either. I eventually switched to aspen and wouldn't go back. Carpet is just too much work.