It is Sunnah when wiping the Khuffayn to wipe both of them at the same time, but that is not obligatory. Some scholars are of the view that the right foot should be done first.

This is how to wipe over socks in wudu: put your 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.

If the time for wiping over the Khuff has ended, and you have Wudu, then your Wudu does not become invalidated according to the correct view. If a person takes off the Khuff or socks after wiping over them, his Wudu does not become invalidated according to the correct scholarly opinion.

Wiping over socks is Sunnah whether they are made of linen, wool, cotton, camel hair or goat hair, whether leather is worn over them or not.

You can do wudu with socks on if the socks have been put on when you are in a state of purity and they are pure, and the wiping may be done within the time specified by Shari`ah.

Wiping over the socks is limited to one day and one night for the non-traveller, and three days and nights for the traveller.When the period ends, it is not permissible to wipe over the socks until you take them off, then put them on after purifying yourself fully with water. You can overcome the difficulty of washing your feet by sitting on a chair, or pouring water over the feet without bending down to wash them.