Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Perfect thickness for exercise mat

It took me awhile to find a 5/8" thick foam mat, and it was worth it. It is the perfect thickness on my hardwood floor, it protects my back and still gives me stability. The only negative thing I can say is that it has a strong chemical smell. It fades over time, just air it out and use Febreze :)