Extremely stable luff reinforcement. The area around the boom cutout is particularly exposed to wear and tear, because the luff panel always forms wrinkles when inserting the mast. Over time, this "accordion effect" may cause cracks in the monofilm. The flexible DURA.LUFF.PATCH reinforces the area around the boom, creates a soft transition to the monofilm while at the same time preventing cracks in the film.