The more steps are walked along the doormat, the more impurities are retained.
Few visitors will stop deliberately to clean their shoes.
The effective doormat isn't the one with large area, but the long doormat.
The doormats stops the solid parts and prevents the expensive flooring from scratches.

Areas of the doormat:
1 AREA doormats - retain the rough, heavy dirts. Doormats made of aluminium profiles with built-in cleaning pads (which allow replacement).
2 AREA doormats - stop fine parts, dust. Doormats made of 100 % РР fiber, connected with PVC base.
3 AREA doormats - retain the moisture from the shoes. Doormats made of short fibers 100 % РР or РА of type "LOGO".