Other suggestions1.Avoiding exposure in the scorching sun for a long time because it's not good for both your health and the lifetime of the hat.2.Wash off timely the dust or greasy dirt inside or outside the hat after a long time wearing.PS:the Head circumference measurement method: Measured from the forehead hair roots,to the back of the head at the ridge point below 2cm, around the circle, minus the hair thickness 1-2cm,it is the head circumference measured.
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