4oz., 6%cotton/4% polyester ripstop short sleeve work shirt; Teflon shield+ fabric protector, repels water and oil-based stains; Triple-needle stitching to reinforce high stress seams; Industrial strength, heat-resistant buttons that test twice as strong as a standard shirt button; Utility patch pockets with hidden left chest zippered security pocket; Right chest drop-behind cell phone pocket ; Hidden button down collar ; vented action back with flex-mesh for breathability and extended range of motion;