The Mac Polo Shirt with Galvin Greens Ventil 8 plus cool layer system enjoys a contemporary design & 20+ UV protection. The Ventil 8 Plus fabric can remove heat & perspiration away from the body at double the rate of ordinary Polyester shirts, this ensures a more constant & comfortable fit. Ventil 8 is the material at the forefront of Galvin Greens multi-layer concept; the material is extremely breathable & has incredibly high moisture-wicking properties. The material has antibacterial properties for that constant fresh feel & the shirts profit from the fact that they are minimal maintenance; no ironing is needed after washing.