When somebody sits on something or lays on something they would be testing the comfort, so comfy testers are people who go round trying to find what is comfiest.
They would compare answers with one another to hear each others opinions on the level of comfyness.
Things that
aren't comfy such as a thorn
bush would get about a 1 out of
10 but things such as memory foam mattress would get roughly a 9,
10 if extreme comfort is found.