These transparent, plastic stiffeners are a practical aid for smooth and perfect-standing shirt collars. Premium shirts and blouses are mostly equipped with an extra, small insertion opening for it. The stiffener is simply inserted there, and any support problems with the shirt collar will be gone in an instant. The stiffeners can be removed just as easily to clean the shirt. They are available in sizes 10 x 55 mm and 15 x 80 mm in cards with 24 units each.