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Sunday Afternoons says:
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.