Although I liked the style of the shirt, I really didn't know what rashgaurd material was until it arrived.  It is almost like a polyester/rayon fabric (smooth and slippery).  It can get wet and dries out quickly (without giving you a rash).  I didn't buy it for the rashguard, but the material feels great against my skin and allows the air to breath through.  I can't be happier with this shirt which goes great with some Nautica swimwear.  I intend to wear it to the beach and an upcoming cruise.