Features 9 oz., green flame retardant cotton sleeves. 23” length. Standard internal elastic at both ends. Made from flame retardant, 100% cotton Westex FR7A. 9 oz flame retardent 100% 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.