Hi Thomast75,
Welcome to the Mattress Forum! 
The SleepEZ organic line does use GOLS certified Dunlop latex, should you choose that configuration. There is no GOLS organic certified Talalay, although you can have a GOTS certified finished mattress using Talalay (see below).
The SleepEZ Organic line uses either GOLS certified 100% NR Dunlop or Oeko-Tex certified 100% NR Talalay. The cover is GOTS certified cotton and GOTS certified wool. The finished mattress itself doesn’t have a certification (which would be GOTS), as this is not a common thing for manufacturers to do. Even if the mattress had a GOTS 4.0 finished product organic certification, it could contain latex which isn’t GOTS certified. While GOTS 4.0 can get quite complex, the easier way to look at it would be that for GOTS they are looking mostly at textiles and the would classify other foams, coils and/or latex as “supports and frames”, which doesn’t figure into the calculation used for the total composition. These “supports and frames” must be GOLS certified themselves, or have a third-party certifications that GOTS approves and along with this certification the manufacturer must meet the GOTS list of banned chemical and certify that they are not using any of those chemicals. I know it’s quite confusing, and much of this has nothing to do with product quality, but that’s about as basic as I can make it.
Both the SleepEZ Natural and Organic line use high quality materials, and the choice of one versus the other would come down to your own personal preference of the importance of an organic standard versus a harmful substance/VOC testing standard such as Oeko-TEX. There is more information about the three different levels of organic certifications in post #2 here and some of the benefits of an organic certification in post #3 here and there is more about the different types of organic and safety certifications such as Oeko-tex, Eco-Institut, Greenguard Gold, C2C, and CertiPUR-US in post #2 here and more about some of the differences between organic and safety certifications in post #2 here.
Phoenix