DuPont Tychem C CHA5 Yellow Chemical Coverall. These Dupont chemical coveralls are made from Tychem fabric which is made up of multiple layers to offer effective protection against ultra-fine particles, concentrated inorganic chemicals and biological hazards. A self-adhesive chin flap and double zip flaps provide a strong liquid barrier, while taped seams ensure that liquid doesn’t penetrate stitched areas. Lightweight and comfortable to work in, they feature elasticated cuffs, waist and ankles to ensure a good fit, and thumb loops to prevent sleeves from riding up when reaching.