- Leather upholstery- Audi tests the quality of all seat leather in its own laboratory, for instance. 45 tests are
used to determine the durability alone. Clamped in automatic jigs, the leather samples have to show how evenly
they stretch, where they start to tear and when they start to develop folds, how abrasion-proof and flame resistant
they are. Only leather that passes all the tests with flying colors is used for Audi seats.