Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Strap causes extreme chafing

I purchased this for my 4 year old son for a trip to Jamaica. He's still learning to swim, and I thought this would be a less bulky alternative than his regular swim vest. At the end of the first day, he was in tears and the inside of his poor little legs were raw from the chafing. He was in so much pain that I couldn't even put any cream on them. The instructions indicated that if it is worn properly that the strap should remain loose when in the water. I think that is probably true, but the thickness of the strap (about 4 inches) would cause rubbing even if it wasn't pulled snugly to his body. We didn't bother packing it back up for the trip home, because I know he won't be wearing it again. A week later and there is still some redness on this thighs.