Safwan narrated from Al-Ala, from Muhammad ibn Muslim, from one of the Imams عليه السلام:
Imam عليه السلام was asked about wiping over leather socks and the turban. Imam عليه السلام replied: "Do not wipe over them (leather socks and the turban)."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 384