Running Shoes on Tisha B’Av, Washing hands etc
You can wear slippers on a fast day, but it’s hard to permit wearing non-leather running shoes Tisha B’Av or Yom Kippur. There is an exception if you’re sensitive. If a man sees semen in his sleep, is this a spiritual disaster? The Yerushalmi versus the Zohar. The basis for washing your hands normally on Tisha B’Av and Yom Kippur.