Blanket is better than nothing.
"Space foam" (various names) is better, although sucks when cold until it warms up a bit.
Trust me, I know.
I have now broken my back twice (non aviation related), spinal comfort is good.
Yes, I have done sorta long flights in a 1-26, no good way to fit there. Kudos to those that do 10hrs or so in the seat....sheesh......thus, "Iron Butt" comment.......