The Ruling on Wiping over Thin Socks
Question:
What is the ruling on wiping over thin socks?
Answer:
One of the conditions of wiping over the socks is that they be thick and cover the foot, so if they are thin, it is not permissible to wipe over them, because the foot, in that situation, is ruled to be uncovered.
Source:
Shaykh `Abdul-`Azeez Bin Baz
Fatawa Islamiyah Vol. 2 Page 101