Cardinals Appear When Angels Are Near. Attractive and inspiring, this doormat insert fits perfectly into our doormat base to create a look you will love; this doormat insert fits snugly side to side, with a little gap on the top and bottom, so as not to create a tripping hazard. Made with mildew-resistant polyethylene terephthalate fibers, it helps to quickly clean and dry shoes. Rubber backing holds insert firmly in the base. Size of insert is approximately 22x10. Insert only - doormat base tray sold separately, SKU# 20018.