Permissibility: prior purification and a later state of minor impurity.
Duration: 24 hours for a resident and 72 for a traveller, counted from the first minor impurity.
Place and extent: wipe the upper part of each khuff by the area of three hand-fingers; the tear limit is measured by three toes.
Causes ending the concession include relevant wudu nullifiers, removing the khuff, expiry, and the onset of ghusl obligation.
Further questions concern residency, travel, overboots, qualifying socks, and dressings. The next chapter is menstruation.