Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Pool cover was very thin

When we first opened up the box and opened up the pool cover we couldn't believe how thin it was. Because we the leaves are falling and the pool is ready to be closed we put it on the pool. We will wait the winter to see if it holds up. I am very skeptical that it will stay in one piece through our windy Wisconsin winter.