•a valid ablution at the time when one wears the khuffs , or socks. •Covering all the feet up to the ankle. •They must be permissible to wear (i.e.: not being stolen, made from silk, etc). •They should be made of pure material. •Do not exceed the time of concession. Khuff is valid for one day and night for one who is in his home town, and for three days and nights for for one on travel.