The 5.11 Tactical Loose Fit Crew Shirt is constructed of a polyester/spandex blend, saddle shoulders and flat-lock seams for maximum comfort. Designed with underarm mesh vents for ventilation, anti-microbial, moisture wicking, and quick drying. This natural fit crew shirt is durable, comfortable and functional, use as a base layer under hunting apparel or your everyday clothing for all day performance.