Our double poly mesh construction wicks moisture better for superior breathability and comfort.. 3.8-ounce, 100% polyester double knit mesh. Double-needle arm seams, shoulders and hem. Taped neck. Flat knit collar. 3-button placket. Open hem sleeves. Side vents. *Due to the nature of 100% polyester performance fabrics, special care must be taken throughout the screen printing process.