Flame Resistant Uniforms - Shirt - lightweight 7oz. Ultra-soft flame-resistant with approximately 88% cotton/12% nylon twill or equal. Pants - lightweight, durable, Nomex or equivalent twill pants. Jackets - should be waist length with permanent lining, adjustable side tabs, 2 pockets and zippered fronts. Outer shell must be ultra-soft flame-resistant with 88% cotton/12% nylon twill or equal. Zipper must be covered with concealed snap closure and hemmed sleeve ends with concealed snap closure. Page 18 Coveralls - lightweight 7oz. Ultra-soft flame-resistant with 88% cotton/12% nylon twill or equal. All Flame Resistant Uniforms must be machine washable. All “Flame Resistant Uniforms” must comply with clothing standard is governed by the NFPA (National Fire Protection Association).