Review on Ringke Slim Case for Samsung Galaxy Z Flip 3 - Premium Thin Soft Hard PC | Non-Slip Grip | Protective Phone Cover for Z Flip3 5G (2021) - Black by Darryl Pendall

This two piece back cover fits well and hasn't slipped yet. Translucent matte, slightly textured so it's not slippery (and not grippy as it is silky). It's not flexible TPU, but it's not brittle either. For the record, my phone is green so the color is getting a little darker (my phone looks grey-black now). Purple or off-white colors may show up better because they are lighter. This is normal for me as I wanted to prevent scratches and there weren't many cases with good reviews in September 2021. The hinge is not protected. See photo.