1. Laws of the Anointing and Wearing Sandals (on Yom Kippur) and in it is 4 paragraphs. It is forbidden to anoint even a part of the body, even to just remove sweat. However, if one is ill, even if not dangerously, or one has scabs on their head, it is permitted.
2. It is forbidden to wear sandals or shoes (made) of leather even an artificial foot and similar. Even made of wood and covered with leather is forbidden; however, of silk, straw, or cloth, or other material is permitted even to go out with them in the public thoroughfare. Parentheses (Rema): And it is permitted to stand on pillows and sheets of leather; nonetheless, one who is strict he gets a blessing [Mordechai of Yoma and Terumas HaDeshen Siman 149]
3. A chayah (woman who just gave birth) all 30 days (after delivery) is permitted to wear sandals (forbidden in paragraph 2); additionally (this dispensation is for) one who is sick or similar, even if not dangerously, and the same one who has a wound on their foot.
4. It is permitted for everyone to wear sandals because of scorpions or similar in order they don't get bitten, if it is found there scorpions or things that bite. Note (Rema): And if there is rainfall and one wants to go to his house from the synagogue or the opposite, and he is of a delicate disposition, it is permitted to wear his shoes until he reaches his place (i.e. destination) [Maharil]