Gore-tex and silicone are synthetic materials widely used in medicine for "alloplastic" implants. Gore-tex is a patented form of expanded Polytetrafluoroethylene (ePTFE) and silicone is a polymer typically composed of silicon, carbon, hydrogen, and oxygen. While these substances perform admirably in other parts of the body, they tend not to do as well in the nose, often becoming infected and rejected by the body. While we aren't certain the exact mechanism by which such implants do well in certain parts of the body but are more problematic in the nose, suffice it to say that when undergoing rhinoplasty nasal reshaping, we always advise patients to utilize their body's own tissue, i.e. cartilage. Septal cartilage, ear cartilage, or rib cartilage will yield the safest, best rhinoplasty results with the least risk of having a devastating failure requiring re-operation. Your surgeon should be able to help you decide which is best for you. Check out Chapters 10 and 12 in my book, Facial Plastic Surgery Complications, that discuss this topic more fully.