Leather has historically been understood by many as being a durable material, but it is a natural material and can fail from time to time. Even though the leather mark certifies that the product is made from genuine leather, it does not prove that it will perform well in the marketplace or necessarily denote suitability for purpose or quality. For this reason, the QualitySure mark can be used on any leather which withstands the suite of physical tests specified by BLC for individual products. The specifications will differ depending on the end product; for example a leather to be used for upholstery will have to withstand different criteria to a leather being used to make a handbag and so on.