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.