EXCEL-FR™, 7 oz., 100% cotton. This Bulwark flame resistant shirt has a banded, topstitched collar. Topstitched sleeve cuffs with button closure. Placket front with button closure. Tailored sleeve placket. This Bulwark FR shirt allows for home and industrial wash.-Arc Rating ATPV 7.7 calories/cm 2 -Hazard Risk Category (HRC): 1