LIGHTWEIGHT. BREATHABLE. INHERENTLY FLAME-RESISTANT. DuPont Nomex® IIIA (93% Nomex® Aramid/5% Kevlar® Aramid/2% Other Fiber) garments are extremely durable, so they aren't damaged by laundering. Nomex® IIIA apparel is preferred by workers in petrochemical and refinery environments and makes a great choice for electric and gas utility workers.