Ultimax Pro features Dri-release Tencel that is soft, dries super fast and has everlasting wicking and FreshGuard odor control. Comfortable, lightweight instep, cushioned sole, foot hugging fit and seamless toe closure. 51% Dri-release Tencel (88% Polyester, 12% Tencel), 28% Nylon, 19% X2O Acrylic,2% Stretch Polyester.