Although composites, or fiber-reinforced polymers (FRPs), have been used for many years in the aerospace and sports-equipment industries, only recently have they been considered seriously for widespread use as reinforcing steel in concrete. The high tensile strength and low weight of carbon, glass, and aramid fibers make them attractive materials for structural applications, and many manufacturers now offer FRP products for both new construction and repair. However, their high price and structural limitations have some questioning the appropriate applications of FRP in the concrete construction industry. Concrete Construction asked a supplier of FRP reinforcement, Doug Gremel of Hughes Brothers, Seward, Neb., and Bill Gamble, professor of civil engineering at the University of Illinois at Urbana-Champaign, for their views on important questions concerning FRP reinforcement.