Features1Made from polyester mesh fabric, breathable and moisture-wicking. 25.5cm wide brim helps block harmful sun rays. 3Elastic band provides a comfortable fit for 52-62cm head circumference. 4Can be used as a helmet liner cap to wear under your helmet. 5Lightweight and comfortable, suitable for Cycle, fishing, hiking, running, camping, etc.SpecificationFeatures:Made from polyester mesh fabric, breathable and moisture-wicking. 5.5cm wide brim helps block harmful sun rays. Elastic band provides a comfortable fit for 52-62cm head circumference. Can be used as a helmet liner cap to wear under your helmet. Lightweight and comfortable, suitable for Cycle, fishing, hiking, running, camping, etc. Specifications:Material: Polyester Color: Color A / Color B / Color C / Color D (optional) Brim: 5.5cm / 2.2in Head Circumference: Approx. 52 - 62cm / 20.5 - 24.4in Weight: 25g / 0.9oz Package List:1 * Cycle CapPackage List1 * Cycle Cap