Toss in the wash with cold water. Air dry. Boom.
Daily Flat
"I love the new supportive insole and treads on the bottom! I bought my usual size in store with the help of an associate. We determined it was a good fit. There was some rubbing at the back that caused a blister when I first wore them. That has never happened with the older flats, so I’m hoping o just need to wear them in a bit. Also, I wish we could buy additional insoles. Please bring that option back!"