. . The 5.11 Rapid Assault Shirt was engineered with direct input from military and law enforcement personnel as an ideal base layer for tactical use in any. . operational setting. Featuring a unique dual fabric construction, the Rapid Assault Shirt consists of a poly/cotton/spandex knit body section that offers. . an agile and flexible base with moisture wicking and quick drying properties, along with ultra-durable poly/cotton ripstop sleeve sections that can. . withstand the harshest environments. A saddle shoulder design takes the weight of body armor without pinching or bunching while providing full freedom of. . movement. Large shoulder pockets provide quick and convenient storage, mesh panels offer enhanced breathability, and the integrated woven collar can be. . worn up or down. When you need unhindered maneuverability and hard charging performance, the Rapid Assault Shirt is the only choice.. . The ultimate tactical base layer. . Designed for use with body armor. . Dual fabric construction. . Large storage pockets at each shoulder. . Mesh panels for breathability. . 1/2 zip front. . Collar can be worn up or down. . Body section is compression fit poly/cotton/spandex. . Sleeves are poly/cotton ripstop. . Reinforced articulated elbows. . Saddle-shoulder design for free movement. . Seamless underarms eliminate chaffing. . Flat lock seams throughout increase comfort. .