. . Engineered with direct input from law enforcement and tactical operators from around the world, the PDU Rapid Shirt from 5.11 Tactical is an innovative new. . design that perfectly complements the use of an external vest carrier. Featuring a unique dual fabric construction, the upper body portion of the PDU Rapid. . Shirt is built from a tough, durable, extra-thick poly/cotton ripstop fabric that supports the weight of your external carrier comfortably and completely.. . Below the shoulders, the PDU Rapid Shirt incorporates a poly/cotton/spandex performance knit fabric that offers enhanced mobility for full freedom of. . movement, as well as moisture wicking and anti-microbial characteristics that keep you cool, dry, and focused during demanding tactical situations. If you. . use an external vest carrier, the PDU Rapid Shirt from 5.11 gives you the speed, agility, and performance you need to overcome any obstacle.. . Unique dual fabric construction. . Toughened shoulders support an external vest carrier. . Agile lower body increases mobility. . Moisture wicking, quick drying, anti-microbial. . 65/35 poly/cotton ripstop twill upper. . 55/37/8 cotton/poly/spandex performance knit lower. . Double strong seams. . Thickened fabric at the shoulders and collar. .