Del, I don't know what they are made of. They do stay dry. The last time I wore one, my paints were soaking wet, but my shirt was dry. So you may be right. However I do not even think the style is correct for a shirt. The cuffs have no buttons. But the way I sweat, they sure are a help. I'll go by what ever the Judge says, got plenty of correct shirts I can wear at NCOWS events. Tj
Just checked the tag, 100% poly.