Abu Muslim (rahimahullah) says that once I was with Hazrat Salman Farsi (may Allah be pleased with him) when he saw a man who had become impure and wanted to take off his leather socks. Hazrat Salman Farsi (may Allah be pleased with him) instructed him to wipe over the socks and the turban, and to wipe the amount of his forehead, and said: I saw the Noble Prophet (peace and blessings be upon him) wiping over his leather socks and his turban (head covering).