I ordered this on the basis that, certainly at the time, it was shown as being a cotton rather than man-made fibre. However, on delivery, it was 100% polyester. Given that I did not want a man-made fibre I have returned it. The returns process was quick and easy. In fairness, although I never tried the cap on, it looked good quality, lightweight And ideal for hot weather. It is not the cheapest of “ball market camps” but still quite a competitive price.