The different leather products must meet not only fashion and comfort requirements. Functional aspects (e.g., abrasion and tear resistance, strain) are also relevant. Consistent quality of the final products is the decision criterion for optimum market positioning and steady and increasing success. The influence of the needle is an important aspect in the planning process. Unfortunately, it is often discovered far too late that the wrong needle was used.

Leather often proves to be very sensitive during processing and necessitates special sewing requirements. Problems such as skipped stitches, damage to the material, and uneven seams often result from the use of sewing thread that is too thick and correspondingly thick needles. Thicker leathers often give rise to skip stitches and uneven seams when the number of layers increases due to the mounting of accessories such as hook and loop fasteners and buckles.