I have to confess, I am not sure. I think FX-P may be the right answer but it may be besides the point. The sponge on the Tenergy rubbers is better than any other sponge in my opinion. After all these years, still, nobody has figured out how to make a sponge that is as elastic and versatile as the Tenergy sponge. The Evolution sponge is excellent but different and not quite as good. But the Evolution topsheet is, on the other hand my favorite topsheet and I like it more than the Tenergy topsheet.
So, if you use the topsheet more than the sponge in your looping, go for Evolution. But if you use the sponge more than the topsheet, then you want Tenergy.
I believe T05FX is harder than FX-P and softer than EL-P. But I honestly don't really know for sure. I have never seen a durometer measurement of the T05FX sponge. I think, one of the reasons is that, in the Tenergy rubbers the FX sponge on all of them is the same hardness. The regular sponge is the same for all of the regular ones too. The rubber in the topsheets is all the same as well. The only difference between 05FX, 80FX, 64FX or 25FX is the hight, thickness and space between the pips. Same with the non-FX versions.
So, because Butterfly has created the feeling of harder and softer by changing the pips, I don't know that the specific hardness of the sponge is often talked about.
I could be wrong on that. Does anyone know the durometer of the TFX sponge? I think the FX-P sponge is supposed to be just about 40-Degrees.
Sent from Godric'sHollow using the ResurrectionStone