ExOfficio Bugsaway Hiker Crew Sock - Men's 25% Wool, 25% Reprieve Polyester, 46% Nylon, 4% Spandex Made in US Made and treated in USA Turn-welt top Spandex throughout Insect Shield technology repels mosquitoes, ticks, ants, flies, chiggers and midges Made in USA & treated in USA Wool is naturally temperature and moisture-regulating Ventilated toe panel