ArmourFit provides elevated support in key arch and ankle zones, giving a tighter, more secure fit. Signature Moisture Transport System wicks sweat away from the body. ArmourBlock Anti-Odor technology prevents the growth of odor causing microbes. Embedded arch support reduces foot fatigue. Seamless toe and contoured "Y" heel for the perfect, comfortable fit. Nylon/Polyester/Spandex.