UA Free Fit features a pre-curved visor & unstructured front panels that conform to your head for a sleek, low profile fit.UA Microthread fabric uses re-engineered fibers designed to give superior stretch & breathability.UA Siro sweatband gives greater stretch & recovery, an ultra-soft feel & more breathable performance.Adjustable, webbed strap closure.Under Armour's mission is to make all athletes better through passion, design and the relentless pursuit of innovation.