Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bottom too big; top too small

The bottom sheet fits like a king size sheet at the foot of the mattress and is smaller at the top of the mattress. None of the corners line up nicely on my new pillow-top queen size mattress. Also, the elastic is very poor quality.The top sheet fits like a full-size sheet and barely covers a queen mattress. These sheets are poorly assembled. Very disappointed.