The scribe of Sayyiduna al-Mughirah (may Allah be pleased with him) narrates from al-Mughirah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) wiped over both the upper and the lower parts of the leather sock.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18063