For carpet Durability
The amount of yard used to make the carpet, measured in ounces per square yard. Pile weight certainly is a factor in calculating the density of a carpet, and does have a bearing on durability, but judging by weight alone does not address other major factors for durability such as, yarn twist, fiber type, and texture. Comparing carpet based on weight alone can be misleading. While a heavy carpet may feel thick and rich, if it has poor twist and fiber type, it will not perform well.