Features: Summer thin cycling cap in 9 simple and classic solid colors, which can be matched with your various kinds of clothing; These thin under helmet bike hat can keep the for sun out of your eyes, wick away sweat and prevent helmet vent sunburns; Brim is hard style and easy to be deformed after strong bending. These solid color under helmet caps are made of polyester, soft to for touch, breathable, stretchy and lightweight, they can absorb sweat and water quickly, providing you with a comfortable wearing experience. Adopting polyester mesh fabric, breathable, sweat-absorbent and durable, this biking cap fits well under your road bike helmet; Multi-functional applied as a sunhat or a helmet liner, the elastic band on the back ensures that it fits most for head circumference of 22-24 inches/ 56-61cm. Suitable for most outdoor sports: these biking hat under helmet are having nice windproof, dustproof, sweat absorbent, for sun protective function; Great for cycling, hiking, running, climbing and other outdoor activities. Share with others: you can share our cycling sweat caps as gifts for your friends or anyone you love, practical accessories provide them with a better outdoor experience. Specifications: Material: Polyester Color: Red, Blue, Purple, Black, White, Tangerine, Fluorescent Green, Pink, Gray (optional) for Head Circumference: About 56-61cm/ 22.05-24.02in Package Includes: 1x Helmet Cycling Hat note: Please allow 1-2cm errors due to manual measure. Pictures may not reflect actual color due to the different monitors.