. . Engineered with input from operators in the field, the 5.11 PDU Class B Long Sleeve Twill Shirt consistently exceeds the expectations of law enforcement. . officers around the world. Designed to stand up to consistent use in harsh duty environments, the Class B Long Sleeve Twill PDU Shirt is crafted from our. . 5.78 oz. poly/cotton twill fabric for the perfect blend of rugged durability, reliable performance, and breathable comfort. A Teflon® treatment maximizes. . resistance against stains, moisture, and soil, our patented 5.11 Hidden Document Pockets offer ample and covert storage, and a bi-swing shoulder design. . provides full mobility. Sewn-in military creases and integrated collar stays ensure a crisp, professional appearance in any setting. Additional features. . include underarm vents to keep you cool and dry, an integrated badge tab, an epaulette kit, and pass-through mic cord access to keep you connected.. . Rugged durability, breathable comfort. . Permanent creases ensure clean lines. . 5.11 Hidden Document Pockets at the chest. . Underarm vents maximize breathability. . Teflon treatment for stain, soil, and moisture resistance. . Pass-through mic cord access. . Integrated pen holders in chest pockets. . Bi-swing shoulders for full mobility. . Secure badge tab. . Includes an epaulette kit. . 5.78 oz. poly/cotton twill fabric. . Integrated collar stays. . Triple needle stitching. . Bartacking reinforcements at key stress points. . Melamine buttons won't melt, burn, or crack. . Fishtail hem for a confident fit. .