The vertical crease at the top of the hat is one of the features of this gentleman's hat, and at that time men had to put on and take off their hats 30 times a day, to take off their hats when they entered a room, to take off their hats when they saw a lady, to take off their hats when their heads got hot, and to take off their hats when they passed a neighbour's house to say hello. So the crease in the middle is a small design to make it easier for the gentleman to put on and take off the hat so that he can apply force.

This top in the 20's began to be very popular hat, in recent years after the New York mob, Indiana Jones and Michael Jackson's successive additions, still in the fashion world has a standing leading position, can be called the hard bottom of the cap world!