Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Terrible experience

This is the worst sleep mask I've ever seen. I am wondering why the review was not that bad which seduced me to buy it. But I certainly regret for my decision. It worked OK at the beginning but soon degraded when the inner cloth detached and the string became loose.Now it is completely unusable and it is only 3 month. Unacceptable!