That the Prophet said "If a Muhrim cannot find sandals then let him wear Khuffs, and cut them, so that they come lower than the ankles.'' (Using translation from Nasāʾī 2680)
سَمِعْتُ النِّبِيَّ ﷺ يَقُولُ إِذَا لَمْ يَجِدِ الْمُحْرِمُ النَّعْلَيْنِ فَلْيَلْبِسِ الْخُفَّيْنِ يَقْطَعُهُمَا أَسْفَلَ مِنَ الْكَعْبَيْنِ