SpeedoUnisex Kids Junior Hydropure Mirror SwiMing Goggles

Spent a long time searching for new goggles for my 7yr old daughter. These are great. My only concern is that they scratched when wiping them with a soft cloth, I switched to an even softer cloth and the same thing happened! I believe it’s some sort of film or anti fog coating perhaps? Either way - My daughter said it doesn’t matter she still loves them, but it was a little strange. However in terms of keeping the water out / fit / ease of putting them on they are really excellent so I’ll be looking to buy another pair for my other daughter when she resumes her lessons too!