UA Free Fit: pre-curved visor & unstructured front conforms to your head for a sleek, low profile fit. Durable, stretch woven fabric provides a comfortable fit & feel. UPF 30 protects your skin from the sun's harmful rays. Mesh panels for strategic ventilation. UA Siro sweatband gives greater stretch & recovery, an ultra-soft feel & more breathable performance. Adjustable hook & loop closure. Reflective details.