i just bought a foam cover at walmart and bought the riding shorts with the foam in them, Im good.
No, actually, not being mean, you are not good. Piling foam on foam is not going to be comfortable. Just the opposite.
I have sat on the newspaper in my Speedo (or sans Speedo as the case might be) and gotten my sit bone number. I purchased my Specialized (Avatar) saddles using that number and am very pleased with the results. I have a somewhat wider than average (for a male) sit bone width, fairly wide. No, I am not fat, 5-10+, 29 inch waist and 154 pounds. The point being for many perhaps it does not matter but for a person who is outside of the norm for their gender, it could make a big difference.