Aertex shirts were made of aertex fabric, it had little holes in it. It was used for short sleeved shirts with collars but I seem to recall other styles as well.
What is Aertex fabric?
What is Aertex Fabric? Aertex is a woven fabric that is very thin, lightweight, and breathable. It has a lot of tiny holes that make it easy for air to flow through. In the summer, it helps keep the body cool, and in the winter, it helps keep the body warm.
Shirt with collar like that is a polo shirt, jersey type fabric without a collar and with short sleeves is a T shirt.