This shirt is perfect for hot spring and summer days. The material is elastic. The size is a little big. I have an M for an average build, fits loose which is normal for me personally. If you're looking for a snug fit, you may need to size down. The material is very smooth and thick enough that nothing shows through. Since it is synthetic, it dries very quickly. I've put the shirt through our normal wash and dry cycles and it looks fresh. highlighted.