The classic multifunctional sun hat has undergone five major improvements in terms of comfort performance. The curvature and size of the face mask has been adjusted to optimise the uncomfortable experience of traditional face masks that do not fit tightly around the eyes. The 3cm external brim design improves the hat's anti-blowing and anti-flip performance. The open vent design solves the problem of summer heat for women with long hair. The dual adjustment system adapts to more head sizes while providing a stable fit.