Al-Matalib al-'Aliyah 102 — Wiping over the leather socks

It is narrated from Yarim bin al-As'ad al-Kharifi: I saw Sayyiduna Qays bin Sa'd bin Ubadah (may Allah be pleased with him), who had served the Prophet (peace and blessings be upon him) for ten years. He relates: "Then he came to the Tigris while wearing two durable, dyed leather socks; he performed ablution and wiped over his leather socks once, and he gestured with his palm and fingers to show that the wiping is done like this over the backs, that is, the upper surface, of the leather socks."
It is narrated from Yarim Abu al-Ala; he said: "I saw Sayyiduna Qays bin Sa'd bin Ubadah (may Allah be pleased with him) urinate, then he came near the Tigris and performed ablution, and he wiped over his leather socks once, and he gestured with his palm and fingers to show that the wiping is done like this over the upper part of the leather socks."