My $80 mistake could be your $30 good fortune. I bought these a year ago and have never been happy with them. I wear 71/2, these are just too loose on my foot. There isn't a size marked on them. I'm guessing size 8. There is a sticker inside one of them. See photo. The crackle is from sitting in a tub, not from wear. I'm offering reduced shipping but am firm at $30. I would like to recoup some of my cost. Thank you.