The SAS Safety SAS-690-2113 Hi-Viz Class-2 Flame Retardant Safety Vest with 2-Tone Reflective Tape, 4X-Large, Yellow is a high-visibility vest designed to help keep you safe while working in hazardous environments. The vest is made of durable, flame retardant fabric and features reflective tape to help you be seen in low-light conditions. The vest is also sized to fit most adults and is equipped with a safety whistle and adjustable straps for a comfortable and secure fit.