No connection with them/her, but I believe "ridge sewing" also does fabric covered TempurFoam wedges.
Yes, related to, "the Karl", yes I use TemperFoam when deadline with a broken back from the early 80's, broke a 2nd time just over a year ago.
Yes, the foam is rock hard when cold, body warmth makes it fit better. Beats the old "rolled up towel" I used to use.