5.11 Tactical collaborated with military and law enforcement personnel to design this high-performance base layer. The Rapid Assault Shirt is designed to function with body armor, keeping your core cool without compromising concealment. It's built with a moisture-wicking compression-fit body and durable poly / cotton ripstop sleeves. The flexible, forgiving body boasts mesh panels for cooling purposes, and the spacious shoulder pockets provide convenient storage. A saddle shoulder construction is designed to hold the weight of body armor without bunching or pinching while flat seams throughout the garment contribute to increased comfort. There isn't an operational setting this combat shirt wouldn't excel in.