These are Decathlon diving fins. The length can be adjusted at the heel. They are quite sturdy and should last a long time. I bought them two years ago and have used them 2-3 times. I couldn't go to the ocean much, so they quickly became too small. As they are fins, there are some minor scratches, but they are still in good usable condition. ⚪︎ Please understand that this is a used item stored at home. ⚪︎ I inspect items carefully, but please understand that I may miss something. ⚪︎ The shipping method may change. If you are concerned, please consult me before purchasing. ⚪︎ No claims, no returns. ⚪︎ Please read my profile.