Block 98% of UV rays! This Sport Hat received an excellent rating of 40-50+ UPF (ultraviolet protection factor)—the highest available! Its crushable design will retain its shape—just toss in a tote bag and go! Combines a 4" crescent-shaped brim with a 5" neck cape and a ponytail opening. Breathable fabric wicks away moisture. Nylon fabric is both water- and stain-resistant. One size fits most with a size adjustment feature.