FWIW, the Desmay is made of polypropylene while the Caze is made of Grilamid TR-90 (polyamide). The Grilamid TR-90 formulation of polyamide, which is the stuff that most sport sunglasses are made of, is generally more durable and flexible than pp, but I have no idea what pp formulation is being used on the Desmay or how it compares. I can say, however, that the Caze ThinEdge bumper that I've had on my iP4, also made of TR-90, has been the most durable case I've ever used, and by quite some margin. My phone has been dropped from 8-10 feet onto rough concrete, repeatedly dropped and skidded from lower heights on streets, driveways, brick walkways etc. and fired at 10 mph into sheetrock, and while the bumper does, of course, show many signs of wear and tear, it hasn't cracked, loosened or otherwise degraded in any substantive manner. All that being said, the ThinEdge is, despite its name, considerable thicker than the Zero 5 so I wouldn't expect the same durability out of the Zero 5, but I would still expect it to be more durable than an average pp case of the same thickness.