Patent ID: 7452586

Claim:
A floor covering comprising: a first layer having a first surface and a second surface, the first layer being made of a polymeric foam material comprising a low-density polyethylene foam; a second layer having a first surface and a second surface, wherein the second layer comprises a film having low-density rich properties at the second surface of the second layer, and high-density rich properties at the first surface of the second layer, the second layer being connected to the first layer; and, a plurality of perforations extending through at least a portion of the first layer, from the first surface of the first layer to the second surface of the first layer, and a portion of the second layer, from the first surface of the second layer to the second surface of the second layer, to allow air and moisture to pass through both the first layer and the second layer, wherein each of the perforations comprises a narrow, elongated slit in the floor covering having sufficient engagement between opposed edges of the perforation to prevent particulates from passing through the floor covering.