U.S. Rub codes:

6,000-9,000 = light use
9,000-15,000 = medium use
15,000-30,000 = heavy use
30,000 plus = contract/maximum use

The best way to measure the durability of any fabric is by looking at its "rub count". This test, known as the The Wyzenbeek test, is the most common way to assess the fabric's abrasion resistance. We carry fabrics with rub counts up to 1,000,000 to meet all your needs.

A machine is used to rub the fabric until it has eroded through, so the higher the number, the higher the amount of rubs it took and the more durable the fabric.