These have protected the little knees and elbows of my son in many a fall from his scooter and bike. They are made of strong thick plastic. The stitching has held up well. After about six months they do show some wear on the plastic from falling against the pavement, but that is to be expected. The only complaint I have is that no matter how tight you Velcro them on they tend to slide some after he has been playing for a while and he has to stop and readjust them.