Material: These shirts are made entirely of heavyweight, high gloss polyester. Sizing: The sizing chart is correct, but these shirts are a snug fit. They are designed to fit snugly against the skin. So if you prefer a looser fit, go one size up. In addition, these shirts have virtually no stretch. Aesthetics: I have a lot of polyester blend athletic shirts. I like polyester sportswear the most. However, I'm not a fan of these shirts. They look like they belong in the 70's. They also feel quite heavy. Breathability: I don't feel these shirts wick moisture or have good breathability. Quality: In terms of stitching and the overall construction of the shirts, they are certainly well made. I have no doubt that they will last a long time. Overall: As I said above, these shirts are well made. They are the exact size. They look like sturdy shirts. However, I'm just not thrilled with the look, weight or feel of these shirts. 3 stars