One of the tattoo shops where I've had some work uses a meat packing thing.

You when you open a package of ground beef, in between the bottom of the meat and the foam tray there is a liner of sorts?

They use those, but clean, unused ones of course.

They work pretty good for tattoos at least. I have one on my thigh where I was having problems with denim rubbing when I walked. I got some of those meat packing pads and used an ace bandage.

Seems to me they would work fairly well for RR too. You can get a few from the butcher or likely buy them (probably in bulk) as well. Don't know what they are called exactly.