ExOfficio Men's Bugsaway Travel Crew Sock 55% Polyester, 9% Tencel, 31% Rayon, 5% Spandex Made in US Made and treated in USA Quick-drying drirelease yarn Turn-welt top Insect Shield technology repels mosquitoes, ticks, ants, flies, chiggers and midges Made in USA & treated in USA Quick-drying drirelease yarn Turn-welt top