Tillman® Flame Resistant FR7A® Cotton Sleeves. 9 oz. green flame resistant 100% cotton. 23″ length; total sleeve length of 27″ (with elastic). 2 1/4″ wide external elastic on both ends. Made from flame resistant, washable, 100% cotton, FR7A® certified. Offers protection from sudden flame exposure, light duty welding and sparks. Cotton fabric meets ASTM D6413-10. ASTM D6413-10 is used to determine a pass/fail criteria for ASTM F1506, which requires a maximum char length of 6 inches.