If you can't stand the heat, get off the jobsite. In UPF 40 fluorescent yellow, you're visible, protected, and ready for anything. This shirt is designed with ripstop fabric for increased durability to withstand the demands of your job. 4.25 oz. Ripstop 65% Cotton / 35% Polyester Ripstop fabric is 75% stronger than other poplin workwear fabric for increased durability. Two-piece, lined collar Button-front closure Pencil stall in left chest pocket UPF 40 rating This product does not comply with ANSI 107-2004 or ANSI 107-2010.