Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great product

These things are really good. I tend to be kind of sweaty, but with these, I can wear dress shirts on hot days and it's no problem. The material just wicks moisture away from your skin and lets it evaporate without staining. And the surface is really smooth so movement is quite easy under other garments. Nice extra layer in the winter, too. Very durable. Get five or so and they should last a couple of years at least.