You work hard and need protection from the possibility of flames on your job site. Walls got you covered. Walls FR. Up your game a level with this button-down work shirt. It'll keep you protected and in style. This shirt is 2112 UL certified and has an HRC level 2 rating. Built with a 7oz. cotton-high-tenacity nylon twill blend, it's both durable and comfortable. Material: Cotton, Nylon.