Hi Egnatu.
Welcome to our Mattress Forum. 
Essentia markets their latex derivative foam as a “natural memory foam.” The claim is that it is softer a less responsive than “normal” latex acting more like what you’d expect from memory foam. They are GOTS, GOLS, and Greenguard certified so you can be assured that the latex is indeed organic.
It’s funny you mention the rubber smell. Latex comes from the rubber tree!
Even though the mattress is made with natural materials, it’s not uncommon for those materials to “off gas” the way a mattress with synthetic materials would. The upside is these “gasses” are not harmful to you the way polyfoam or true memory foam gasses would be. The smell is unpleasant, but shouldn’t last long. If it continues to bother you both, there are additional steps you can take to help dissipate the smell faster. Let me know if you need assistance there
It’s an excellent sign that you’re feeling comfortable on the mattress. Like Burpleson said, the most important thing is that you’re getting quality sleep on the mattress (in that you’re well supported and comfortable). But, if you would rather return it, Fox is an absolutely wonderful company that I know you’ll have a great experience with.
Also, it’s not uncommon for a mattress to have that reaction when a pinpoint amount of heavy pressure is applied. Mattresses are meant to evenly distribute weight across the surface, not to perform under dense, microfocused pressure. I wouldn’t let that be cause for concern, unless you’re feeling that the mattress could bottom out if you’re simply sitting on it.
They actually trademarked that phrase. Essentially, they feel they go beyond just organic by using vegan, non toxic certified technology. It’s a marketing ploy more than anything.
I hope this helps in some way!
NikkiTMU