Toss in the wash with cold water. Air dry. Boom.
Bring back the original flat
"The new flats are such a strange shape and fit. I ordered the same size as my old flats and they were so big they just fell off my feet when I tried to walk. I returned those and ordered a half size down, and now that size crushes the tip of my big toe. I also don’t know why they changed the cut on top. It is way less cute and makes my feet look bigger"