Heavy trekker men’s socks are made with T3 technology, which means that they are made of three layers of fibers for maximum performance The combination of materials used (51% Primaloft, 29% Nylon, 10% Merino and 10% Nylon stretch with Lycra) guarantees maximum protection and keeps your feet warm and comfortable even on longer treks. The socks are very comfortable, soft, wick away moisture, are antibacterial and warm even in the event of moisture. They have flat seams in the toe area to prevent unpleasant bruises.