MATERIALS AND METHODS: One hundred patients suffering from clinical and/or urodynamic stress urinary incontinence (SUI) were randomized into biological material TOT (PELVILACE® TO) or synthetic material TOT (ALIGN®TO Urethral Support System) groups. Preoperative and at 1 year postoperative urogynecological symptom assessment, 1-h pad test, 4-day bladder diary, stress test, Q-tip test, and urodynamics were performed.