The shell material is perfect for my purposes. Had previously a rectangular look-Silicone Cover, which is already worn out after a few days and also was a Fusselmagnet. The iProtect TPU Gel Case, however, is flexible, it does not stretch by mechanical stress. Moreover lint remain not depend on it. Especially the bright green is striking, then only the rectangular look, but it also has the advantage that the device stands out, practically, when placing it between other things and want to find it again quickly.