A lot of girls and boys with hair long enough to require a cover still try to use swimming caps. This check insures that they not only have means to cover their hair, but also is a time when you are not on the clock for an official to approve the devise you are wearing as both safe and adequate. If you show up at the mat with special equipment that the official declares to be improper and it has not been approved during weigh in, it will cost you a point and injury time will start until you get the situation corrected. In the end this rule (as most rules are) is in your wrestlers best interest (male or female).