Abd al-Razzaq (may Allah have mercy on him) said: I asked Ma'mar (may Allah have mercy on him) about a khuff (leather sock) that becomes torn, and he said: When anything comes out from the areas of ablution, do not wipe over it; rather, take them off.
He said: Abd al-Razzaq (may Allah have mercy on him) narrated to us; he said: I heard Sufyan al-Thawri (may Allah have mercy on him) saying: Wipe over them as long as they cling to the foot, even if they are torn. Then he said: The khuffs of the Muhajirun and the Ansar (may Allah be pleased with them) used to be torn like that. The view of Ma'mar bin Rashid on this matter is more beloved to us.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1347