Size: One size fits most peopl,adjustable(56cm-60cm) This baseball cap has many small holes that are very breathable, even during vigorous exercise, the heat dissipation is much better than the ordinary baseball cap. Breathable quick-drying polyester mesh baseball cap, suitable for outdoor climbing, cycling, running, sports, fishing and travel, etc. Its material speed-drying polyester mesh fabric enables air circulation to allow the skin to breathe and keep you dry and comfortable every time you exercise.Cap depth 11cmHat brim 7.5cmWhole body 360 degree mesh, sweat band is adopted to fit the human bodyThe skin design gives you a comfortable body feeling. The hat strap uses a thick fish ribbon to extend the service life. The size can be adjusted. It is suitable for all kinds of scenes. It can be used for both men and women. It is breathable and quick-drying in summer and simple and generous in spring and autumn.Adjustable buckle: It adopts adjustable buckle design, which can adjust the size by itself, which is simple and convenient to use. A variety of colors can be chosen, each color, not the same collocation, for a style, for a mood.