Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Pockets not deep enough

I purchased these sheets for a mattress that is 15" high Sterns and Foster Mattress and it does not fit the mattress very well at all. There are 2 corners on one end that it is about 2 inches from the bottom. I am not happy with my purchase and I doubt about the 18" pockets if that is accurate.