Sleep EZ Covers

Thanks. Your website photo does not match what you just posted here, so I wanted to be sure.
I have some additional questions after reading post #3 https://forum.mattressunderground.com/t/stretch-covershere. Will I have more degradation of my 3 latex layers sooner, if I use your stretch knit cover, over all 3, vs using the thicker wool cover over the bottom 2 layers and pairing that with a 3" topper, enclosed in a stretch case?