The mac polo shirt with galvin greens ventil 8 plus cool layer system enjoys a contemporary design and 20 uv protection the ventil 8 plus fabric can remove heat and perspiration away from the body at double the rate of ordinary polyester shirts this ensures a more constant and comfortable fit ventil 8 is the material at the fore front of galvin greens multi layer concept the material is extremely breathable and has incredibly high moisture wicking properties the mac as been designed with n