´It was narrated that 'Ubaid bin Juraih said:` "I said to Ibn 'Umar: 'I see you are wearing Sibtiyyah sandals, [1] and you performed Wudu' in them.' He said: 'I saw the Messenger of Allah (ﷺ) wearing then and performing Wudu' in them.'" [1] Made of hairless, tanned leather.
Hadith Referenceسنن نسائي / صفة الوضوء / 117
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:متفق عليه