Hi sandsock.
You can see the ILD range for Latex International’s 100% natural Talalay (expressed as N1 - N5) and the target ILD’s for their blended Talalay and Talalay GL on their site here. You can also see the ILD range for Radium100%naturalandblendedTalalayhere.
While knowing the ILD (Indentation Load Deflection) is a good indicator of softness/firmness caution I’d suggest that to not base your decision on the ILD alone. as this accurate only when comparing the same type of latex from the same latex manufacturer. There is also much difference in feel when comparing synthetic, blended latex and 100% natural latex of the same ILDs (see post #6 here). In addition to this equivalent ILDs from the two Talalay producers, Talalay Global and Radium, also feel different so you can’t make a direct comparison based on ILD. With careful testing your body will tell you much more about whether any specific combination of layers or components or any specific mattress is a good “match” for you in terms of comfort, firmness, and PPP (Posture and alignment, Pressure relief, and your own Personal preferences) than knowing the ILD/IFD of the individual layers regardless of what the actual numbers may be.
Phoenix