I haven't had many opportunities to use these, and I don't plan to use them in the future. There's a faint line on the instep of the right foot. It was there when I bought them, but I used them anyway because I didn't have time to exchange them. Please purchase only if you understand this. Water doesn't easily get in, so I didn't have to wipe my feet. Depending on how you use them, they should be okay with water soon. I thought the price was high, so I wondered if the construction was well-considered.