Laces are exposed to continuous movement every day, when user laces and unlaces them. This can cause a lace failure if the lace is not of an appropriate quality. Additionally this causes many unpleasant moments to the wearer, because the walking in unlaced shoes is dangerous and non economic.Additionally to this test is sometimes performed also the test on dynamometer, which measures tensile and elongation capabilities of laces. Often, the lace fails just in the moment of tight lacing procedure. That is why both tests are interconnected.