Abstract: There is provided a one-size-fits-all hat that requires no size adjustment, the hat being able to sufficiently protect a head, offering no uncomfortable fit to tightly press the head, and causing no headache from long hours of wearing, the hat offering a soft fit and being prevented from moving on the head, and further the hat being able to sufficiently absorb sweat. In the hat, a slip is provided in a forehead portion in a lower end of the inside of a crown, a notch is provided in a lower end of a rear head portion and/or a side head portion of the crown, and a stretchable member having the same shape as the notch is connected to the notch.

Abstract: A hat is provided with an insertion hole adapted to permit a temple of a pair of glasses to be inserted therein, positioned in each lateral side of the edge portion of the crown of a hat. The hat is so formed as to permit the temples of the glasses to be positioned between the crown and the slip band that is provided along the inner surface of the edge portion of the crown.