Hi Slowdog,
Knowing the ILD of the layers wouldn’t make any practical difference because ILD/IFD by itself is just one part of a bigger picture that will affect how soft or firm a material will feel for you (see post #4 here). It really won’t give you any meaningful information about how soft or firm the mattress would be for you or how good a match it would be in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) unless you were very knowledgeable and experienced with all the specs that can make a difference in how soft or firm an individual polyfoam layer feels to you and you were also familiar with how combinations of different firmness levels and layer thicknesses would feel for you. Most people don’t have enough knowledge or experience to be able to “translate” ILD/IFD information along with all the other specs that affect the feel and performance of a mattress into terms that would be meaningful for them or that they would be able to predict how the mattress feels and there are so many variables involved in mattress design that even experienced mattress designers are often surprised at the difference between what a mattress “should have felt like” based on the specs and “theory” and how it actually feels in “real life”.
While they are certainly a great quality/value choice for a low budget or temporary mattress … you would be much better off talking with them on the phone so they can help “talk you through” your choices using terminology and information that would be more meaningful and understandable for you.
Phoenix