Praise be to Allaah.
With regard to the beginning of the period when one may wipe
over the slippers or socks, it begins from the first time one wipes over
them after breaking one’s wudoo’, not from the moment one puts them on. See
the answer to question no. 9640.
The way in which one wipes over them is to put one’s wet
fingers on the toes then pass them over the feet to the shin; the right foot
should be wiped with the right hand and the left foot with the left hand.
The fingers should be spread when wiping and it should not be repeated.
(See al-Mulakhkhas al-Fiqhi by al-Fawzaan, 1/43).
Shaykh Ibn ‘Uthaymeen
(may Allaah have mercy on him) said: “This means that what should be wiped
is the top of the sock, passing one's fingers from the toes to the shin
only, and one should wipe with both hands over both feet together, i.e., the
right hand should wipe the right foot and the left hand should wipe the left
foot at the same time, just as one wipes the ears, because this is the
apparent meaning of the Sunnah, as al-Mugheerah ibn Shu’bah said, ‘Then he
wiped them both.’ He did not say that he started with the right, rather that
he ‘wiped them both’. So this is the apparent meaning of the Sunnah. If we
assume that he cannot use one of his hands then he should start with the
right before the left. Many people wipe the right foot with both hands then
the left foot with both hands, but there is no basis for this as far as I
know. No matter how it is done, wiping the top of the slipper (or sock) is
sufficient but what we have said here is best.”
(See Fataawa al-Mar’ah al-Muslimah, vol. 1, p. 250)
You should not wipe the
sides or back of the sock because there is no report concerning that.
Shaykh Ibn ‘Uthaymeen
said: “Someone may say that it is the bottom of the slipper or sock that
should be wiped, because this is what is in contact with dust and dirt. But
if we think about it we will see that wiping the top of the sock is what
makes sense, because this wiping is not for the purpose of cleaning, rather
it is an act of worship; if we were to wipe the bottom of the sock that
would make it more dirty.” And Allaah knows best.
See al-Sharh al-Mumti’ by Ibn ‘Uthaymeen, vol. 1, p. 213.