This cap is light-weight, low-profile, and seriously ready for adventure. UPF 50+ sun protective, with bluesign certified fabric with PFC-free durable water repellent finish featured on the main body, mesh, and comfy wicking sweatband. With a simple adjustable sizing system, this hat is crushable and packs well without losing its shape. Sunglass Lock keeps glasses in place while the handy cutout in back makes this cap very ponytail-friendly.