Gortex was designed for its ability to allow water to move in one direction. So it's excellent in foul weather clothing-as an implant, not so much. There are few non biologic materials that can be used in the face with success. These are limited to the implants that are placed against the bone for cheek, jaw, etc enhancement. Most of these work because they are fixed to bone and have adequate soft tissue coverage.
When placed in the face Gortex will encapsulate and can easily become infected, extrude, migrate or distort. It's an incredibly poor choice for volume enhancement. Proper fat grafting is a natural and effective way to correct your problem. When done correctly there is a high take rate and excellent volume correction.