Galvin green mitchell polo shirts the mitchell polo shirt sporty modern design with 20 uv protection and galvin greens ventil 8 plus cool layer system the shirts come in five colour variations with striped upper chest pattern sizes range from sml to 2 xl ventil 8 is the fabric behind galvin greens multi layer concept the fabric is tremendously breathable and has very high moisture wicking properties the ventil 8 material removes heat and perspiration away from the body at double the rate