Finally I found a cap that does not "whistles on its last legs" even with a head circumference of 56 cm. Since the cap comes in two sizes, I ordered the size S / M and even had to put something on, so it is conveniently located to Velcro. Appreciated it is perfect for 54-58 cm head circumference in this size. I was impressed by the manufacturer indicating the sun protection factor 50, because I always wear a cap against the sun only in summer midday runs. The screen is also in this race cap quite short (7 cm) and the cap top is flat against the head. The material feels valuable and is very thin and light. In relation to the caps to the 30, - cost EUR, an absolute bargain. Now they must prove itself in the run-practice, my first impression: I would buy it again.