Remains permanently handsomely.

I have this cover in transparent and green. Both dark not retrospectively from or are somehow "nasty".
The material remains flexible and will not crack. The fluted (looks like a diamond grid) surface on the long-edges ensures good grip and has the Lumia certainly preserved before some crashes.

I have this cover then very quick decision ordered before a holiday and needed it delivered very quickly. The request was granted, and it arrived on time. Bottom line: Could not be better! For all future devices I'll check these vendors first.