The breathable, textured knit fabric is very soft for all-day comfort. UA Siro provides greater flexibility and better regeneration, the material is extremely soft and breathable. Adjustable fastening with a two-tone strap. Improved back opening for more ways to wear your hair. Embroidered logo. UA Free Fit: Pre-curved visor and unstructured front end conform to your head for a sleek, low-profile fit.