While many people assume steel doors are the most secure against forced entry, Therma-Tru fiberglass doors are up to 30% more resistant to kick-ins than standard steel doors.** Standard steel doors can dent and bow, which leads more quickly to product failure. Therma-Tru fiberglass doors feature durable construction that can withstand impact by absorbing and deflecting the force.** Wood doors and steel doors may weaken over time with exposure to the elements.