Patchworks Sentinel case is composed of TPU body and Polycarbonate bumper. Cutting-edge technology was used to achieve non-yellowing, clear transparent Smudge-Free TPU body. Micro textured surface prevents oil-looking smudges on the back when it’s installed. Polycarbonate bumper perfectly matches with 5 natural iPhone colors. This powerful dual layer case provides military-grade protection on both screen and rear camera with raised lips.