I bought the cheapest carpet at lowes (4'1" of it) and just layed it down in the back. I think the E's width is just under 4 feet. Took my utility knife and cut around all of the edges. The carpet cuts with ease if you have a sharp blade so it was not to difficult to get a good line. The carpeet was $22.00 and I have enough left to do another round if this one gets dirty or moldy etc.