Gore-tex is a well known facial implant material that has been used from anything from facial bone augmentation to a subcutaneous implant for lips, nasolabial folds and in dorsal augmentation in rhinoplasty. It is flexible and easily compressible and is modified form of microporous plastic. It has a fairly good track record of facial implant use provided it is properly used with good soft tissue cover.
Gore-Tex is a brand name for a plastic material that is used as a substitute for tissues throughout the body. It is fairly commonly used for building up the roof of the nose ("dorsal augmentation", and is predictable and generally leads to excellent rhinoplasty results. However, you should be aware that there is a very small but real risk for infection with the material, so choose a surgeon who has experience with using it.