Hi scarlet113,
SleepEZ has several options that include 100% natural Talalay, 100% natural Dunlop, and blended Talalay depending on which line you choose.
As far as I know Flexus uses 100% natural Dunlop and blended Talalay (blended Talalay contains 30% natural rubber so it’s often called “natural” rather than 100% natural).
Both of them would be very durable materials in a suitable firmness range and there is more about the differences between them in post #2 here. If the source of the 100% natural Talalay is Talalay Global (previously Latex International) then the blended could be slightly more durable in lower ILD’s and if the source of the Talalay is Radium then they would be closely comparable in terms of durability.
Phoenix