Although the case might not get yellow (which I cannot guarantee now). The build quality is poor. The speakers hole were not open and i had to manually do resulting in bad audio quality. Also the thine plastic line above the charger hole broke in just 2 days.
Most of the time when we buy covers it make our phone bulky. Plus if it's a transparent then it will turn yellow win a month but not with this one. It's sturdy slim and anti yellow. I used it earlier also and they are correct that it never turns yellow. Go for it a must buy.
Ordered cover for X200 FE.. delivered on expected date and packing was extremely good but not satisfied with the quality of the cover
This cover was absolutely great in all aspects like it's appearance, Comfort n the look as well hope it will not get yello after sometime otherwise it's really good cover to have.