Is it permissible to apply masah over anti-varicose socks?
Special socks worn for treatment of varicose are considered as the bandages on broken/dislocated bones. One may wipe over the bandages on broken/dislocated bones. (Ibn Majah, Taharah, 134; Kasani, Bada’i,I,13-14; Ibn Abidin, Radd al-Muhtar, I, 468). In this respect, it is permissible to wipe over anti-varicose socks while performing ablution. However, if the anti-varicose socks worn are not covering feet entirely, the uncovered parts must be washed.
Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS