FR MATRIALS: 6.5 oz. 100% FR-treated cotton with a generous comfortable fit,Stitched with durable FR threads. Mesh on the back of the shirt and underarms allows for airflow circulation. Wave your arms for a cool summer.Flame retardant shirts with pearl snap buttons for quick on/off and time savings. ENSURE SAFETY: FR tags are easily identifiable on the left sleeve and on tag next to the left breast pocket. ATPV 8.2 cal/cm (PPE Cat 2) NFPA 2112; ASTM F1506;NFPA 70E. PRACTICAL DESIGN:Back vent, and shoulder seams, double-needle stitching ontwo chest pockets with flap, pen hole on left chest pocket flap. Curved hem provides enhanced protection when shirt is untucked. PREWASH/ PRESHRUNK: VANDISI pre-shrinks its durable 6.5 oz 100% cotton knit fabric, so that’s not a worry as long as you follow the wash instructions. These fit true to size but are long in the body so they stay tucked in. MULTI-USE: Made for welders, fitters, ironworkers, electricians, oil workers and other industrial workers even at home. Attached a small sample inside package for customers simple FR try. Tested to maintain protection through 100 home washings.