Schools bring in hair straighteners to encourage girls to do sport. It is this increase capacity of the higher end GHD straightening irons, It has been reported that several school in Scotland have brought in GHD Hair straightening irons in a bid to try and encourage girls to take part in GHD Straighteners sports and physical education.such as the ever popular GHDs, tyfitsb20110720 that have made these devices something that most women could not do without according to officials.