A rug includes a foam base layer and a top layer which is fixed on a top of the foam base layer. The base layer has a plurality of holes and separation portions which are located between the holes. The top layer is woven by plastic fibers and is a porous top layer. The top layer is conveniently woven by artificial plastic fibers so that different patterns and colors are available. The foam base layer is resilient and the holes are good for ventilation.