The ability of light leathers and leather-cloth used in manufacture of shoe uppers, gloves, and garments to withstand repeated flexing without cracking is determined with the help of a flexing endurance test.
In this test, test specimens in shape of rectangular pieces are folded and clamped at each end to maintain them in a folded position in a set of grips, one of which is fixed while the other is able to oscillate. The movement of the oscillating grip causes the fold in the test specimen to run along its centre. This operation is carried out repeatedly and the test specimens inspected periodically to assess the damage produced. The equipment used for this test is called as Flexometer.