Precise engineering and leading technology are therefore important Polo components. The internal back construction for example, is a molded composite, reinforced with glass-fibre, with raceways for the optional Schukra lumbar mechanism (found in today%u2019s prestigious European and North American automobiles). The mechanism is activated by conveniently located high tech hand wheels at the base of the back, for vertical and horizontal adjustment, providing precise support at the unique lumbar curve of the occupant.