It is the yellow part. It's just coming unglued from the main black part of the cleat. I have been using cleat covers all winter long and I guess the taking off of the cleat covers has caused the front part of the yellow front piece to start to come off. The yellow piece still looks good, it's not worn at all. It's just starting to come unglued. I was thinking the yellow piece was part of the structural side of the cleat...maybe I'm wrong on that.