5.11 Tactical's new generation of sturdy pants, shirts, and jumpsuits is known as Tactical Duty Uniforms (TDUs). MILSPEC in appearance, the TDU Pant has a self-adjusting comfort-waist free of irritating metal buckles. The pants also feature cargo pockets with magazine compartments and 5.11's proprietary Back-up Belt System (BBS). Both seat and knees are double-thick, and removable neoprene kneepads are free with purchase. TDU pants are available in three 65-percent polyester/35-percent cotton blend fabrics: 7.5-ounce ripstop, 7.2-ounce twill, and the new 6.14-ounce Taclite version.