this protection is rigid, totally adaptable to the S4 with a thickness on visible, but with very smooth edges. contact with the screen is improved by touch (softer, less fingerprints!), and no functions will appear disturbed. the installation kit (product, cloth, squeegee) allows adaptation without any trace or dust, as opposed to flexible films. The high price is justified for this high-end protection to be accorded to large screens of high-end smartphones. The kit also contains three colored buttons used to cover the center button of the phone to put everything on the same level, but also a transparent flexible film to protect the back shell of the S4 with all necessary cuts.