Sayyiduna Thawban (may Allah be pleased with him) narrates: I saw the Messenger of Allah (peace and blessings be upon him) perform ablution (wudu), and he wiped over his leather socks (khuffs) and his khimar, meaning his turban.
Hadith Referenceالمعجم الكبير للطبراني / باب الثاء / 1396