Hi katherine1,
As PapaMike mentioned … the SleepEZ natural line gives you the choice between blended Talalay or 100% natural Dunlop and their organic line gives you the choice between 100% natural Talalay and 100% natural Dunlop and their covers are also different. They can provide organic Dunlop on request but there may be an extra cost.
There is more about the different types and blends of latex in post #6 here that may help you choose between them but the biggest reason to choose the organic would be if you preferred the 100% natural Talalay vs the blended Talalay and the differences in the cover probably wouldn’t be enough by itself to choose one over the other.
Phoenix