The conditions of socks that might be wiped over

Q: Should socks be of a certain thickness to be wiped over during Wudu' (ablution) or not?

A: All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions. It is obligatory that the socks should be thick and not show what is under them.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.