LIGHT&BREATHABLE:By applying super light and moisture wicking fabric and massive mesh design, it brings you a lot of cool and comfortable.Material is very soft and this cap is unconstructed.FAST DRY& SUPERIOR SWEAT ABSORPTION:With quick drying feature of the fabric, the cap can dry out fast to enable you everyday use. Improved high quality soft sweat band is more functional and cozy.FOR SMALL AND MEDIUM HEAD:Adjustable back metal strap closure offers a custom fit. This cap depth is comparatively shallower than other regular baseball cap. Cap size is more suitable for small and medium head, Not for very big head.(refer to size information below)SIZE :(S/M/L) Numeric Size:6-3/4"-7-1/4";Head Size:20-7/8”-22-13/16”(53cm-58cm). Cap depth:4”(10cm) Bill length: 3-1/8” (8cm) This cap is unconstructed.OCCASION: Great for running, hiking, tennis,golfing,baseball, camping... It can be used all the year round,especially for hot days.