The EVOLUTION Upholstery Tool was designed to smooth airflow and boost water recovery performance as compared to the harsh angles of a steel tool. Best of all, the glided head moves across the upholstery fabric better and increases water recovery. The EVOLUTION Upholstery Tool was designed to smooth airflow and boost water recovery performance as compared to the harsh angles of a steel tool. Best of all, the glided head moves across the upholstery fabric better and increases water recovery: