This white overall is made out of 35% cotton, 65% polyester, and twill. It meets the standards for ASTM f1506, NFPA 70e, NFPA 2112. Overalls (sometimes called bib overalls) are made of durable materials to withstand rugged use. They are sleeveless garments that cover the torso and legs. They are cooler than coveralls and layered with a shirt or jacket.