Instruct: Classify the given Amazon review as either positive or negative.
Query: Weak velcro stitching, too short to provide adequate padding

I ordered these as a total novice for simple heavy bag workouts about three months ago. I was pleased with them at first, but now I'm ordering something else. On one of the three sets the stitching holding the velcro down came completely apart during the very first wear. The others are now weakened too. I had a friend restitch them. I like that they're 100% cotton, but that means that the crinkle up and can be hard to wrap flat. I run a hot iron over them now and then. Finally, now that I've been in training a few months, I'm hitting much harder, and these wraps just aren't long enough to provide enough padding. My knuckles are bruising during training.