Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Not a good product

First, I had a terrible time molding the ear plugs to fit my ears, and then once I had them in, they didn't work. I could hear exactly the same as when I didn't have them in. The instructions mentioned that you are suppose to make an air tight seal. I assmused the first time I tried to fit them and make the seal, that it was just me, being that it was the first time. But when the second and the third try of putting them in didn't work, the product is not good.