Thorlo Over-Calf Boot Sock. THORLO is a third-generation family company, and considers its employees part of that family. Everyone is committed to craftsmanship, and with that craftsmanship comes quality, value and the benefit of better feeling feet. ThorLo takes pride in making the best products and they care about the people who wear them, as well as the people who make them. ThorLo believes this kind of culture and commitment cannot be reproduced in another country. The words “made with pride in the USA” are forever etched in ThorLo's minds and hearts.