Commercial-grade carpeting ranges in weight from 22 to 46 ounces or more usually given as per square yard. The higher the resultant number, the higher the carpet pile density. The denser the carpet, the more durable it will be. Select a density level suitable for the traffic level where the carpet will be used. Yarns may be made of filament or staple fibers.
Filaments are long fiber strands measured in miles.
They often are referred to as continuous filament fibers. Silk is the only natural filament fiber. A mono-filament yarn is made of a single fiber filament. A multi-filament yarn is made of multiple fiber filaments. These may or may not be twisted together.