Describing How I Really Look

I am a rectangle that lays on any dirty surface.

I get stepped on, kicked, stomped and used.

I collect your sand, grime, mud and other unwanted debri.

I live in your ins and outs waiting for your comings and goings.

I can be replaced when your taste, needs and want changes.

I am thrown away when my stains show and threads bcome bare.

I have a real name, but I mostly answer to Mat and Rug