II replaced my helmet padding with heel pads designed for shoes.
Heel Helmet Pads by
Timothy Takemoto, on Flickr
They are not attached with velcro so they can't be taken out and washed, but they can be wiped. They are $2 a set.
https://www.aliexpress.com/item/1005002857176293.html
I will try helmet liners at $4 next time.
https://www.aliexpress.com/item/4001223429129.html