FR Uniform Shirt | Hi-Viz Class 2 | 7oz. 100% CottonLAPCO FR flame resistant hi visibility uniform shirts give you the comfort and safety you have come to expect, plus added features to make sure you stand out in low visibility conditions. 360 Visibility. Four rows of lock stitching on the front placket to prevent unraveling. Double needle stitching on pockets, flaps, and shoulder seams. Sewn with Nomex thread. Color matched FR buttons. Uniform styling with a back pleat for ease of movement. 3M