Good point. The ones that I am using were new when my parents were moving, they bought too many so they gave me a couple of new ones and used ones. The used ones I use on the ground for working under the car quite comfortable, it beats laying on the hard cold cement in the garage.I use the moving blankets that I have, there nice and thick if you fold them in half.
Just make sure they are clean with no hidden particles , like metal shavings or tiny rocks/dirt from the moving process they were previously used for.
me no want no scratchy !