Port Authority® - Portflex 2nd Generation. C861 Fabric/Style: With a choice of sizes and a touch of spandex, you get just the right fit. Enzyme-washed for a lived-in look and feel. 97/3 washed cotton twill/spandex; low profile with six panel construction. Portflex 2nd Generation features unstructured construction and self-fabric sweatband that allow for more overall flexibility and a better fit. Adult sizes: S/M, L/XL