My customers wanted dri-fit and these are 100% polyester, but they are not the silky dri-fit. They are more like a jersey net. THEY RUN SMALL. Order a size up if you want a more relaxed fit. They are still good quality but my customers were wanting silky. I ended up still using the shirts because my customers were flexible but just know it's not the silky dri-fit, it's more of a jersey knit.