Question
Since removing the khuff invalidates the wiping over it, what is the considered amount for the foot to exit the khuff?
Answer
I say, and with God's success: The considered measure for the foot to exit the shoe is the exit of most of the foot to the leg of the shoe; because the majority has the ruling of the whole; and this is to avoid the hardship of the lesser part of the foot exiting. See: Maraqi al-Falah, p. 133, and God knows best.