JOG Polos come in variety of styles and material that use HRT(Heat-Removal Technology). It is a combination of two polyester micro-fibers along with that very important cooling layer on the inside. Our VaporICE-Max material is our higest grade of HRT material because of it is extremely lightweight and dries extremely fast thus keeping your body dry and comfortable for a long period of time. JOG VaporICE-MAX also comes in a Lycra/Polyester blend that has more of a stretchy look and feel. JOG's next grade of HRT is JOG VaporICE which is synthetic polyester specially designed release the heat and sweat to the outside, which makes the wearers, feel comfortable and dry. JOGsportswear also carries a variety of high quality cotton polos, and cotton polyester blends (upon request).