With this bug-free and travel-friendly sun hat, you will be prepared for your everyday adventures! This hat is made out of wicking fabric and has UPF sun protection. Details: Built-In Insect Shield protection, UPF30 sun protection, moisture wicking fabric, ultra flexible packable material, adjustable drawcord for custom fit, durable braided cord. Brim size (for S/M): 4 1/2''. Material: Nylon.