The data table in part 2 shows the thickness as 70 mm, per the web site.
However, when you lie on the mat is is not that thick unless you inflate really hard, and inflating really hard makes it rather uncomfortable. So the numbers for the Synmat in the graph only go up to about 45 mm, but these are very realistic numbers.
It may be that the graphs for some of the other mats should not display data at peak thickness, just to be consistent. After all, they are never at peak thickness in the field. Mea Culpa.
EDIT: OOPS! the data table in the mini-review shows 35 mm thickness - that is WRONG! I will ask addie to correct it asap. I cannot check my original copy at present as a series of disk crashes (lightning) has temporarily rendered 15-20 years of files inaccessible. Designs, photos, track logs, BPL files, etc. Sigh.
For what it is worth - we have one Synmat UL7. Well, my wife Sue has it. I am seriously considering BUYING a second one for myself.