Fiqh-us-Sunnah Volume 1, Purification and Prayer, Fiqh 1.044.

Wiping over the socks is part of the sunnah. An-Nawawi states, “All those who qualify for ijma’ (consensus) agree that it is allowed to wipe over the socks–during travelling or at home, if needed or not–even a woman who stays at home or a handicapped person who cannot walk can do so. The Shi’ah and Khawarij reject it, but their rejection is not valid. Says Ibn Hajr in Fath al-Bari, “All of the preservers (of hadith) are of the opinion that wiping over the socks has come through a continuous transmission. Some have collected all of its narrations (from among the companions), and its number exceeds eighty. This includes hadith from the ten people who were promised Paradise.” The strongest hadith on this point has been related by Ahmad, al-Bukhari, Muslim, Abu Dawud and at-Tirmizhi on the authority of Hammam anNakha’i who said, “Jarir ibn ‘Abdullah urinated, performed ablution and wiped over his socks.” It was said to him, “You do that and you have urinated?” He said, “Yes, I saw the Messenger of Allah, upon whom be peace, urinate and then do likewise.” Said Ibrahim, “They were amazed at that hadith, because Jarir had embraced Islam after surah al-Ma’idah was revealed (10 AH). One of its verses calls for washing one’s feet. This hadith helps us understand the verse by confining it to one who is not wearing socks. This constitutes a particular case, and the person who wears socks can just wipe over them.