Why do the matrices on pull out couches have plastic on it?

Question

Once when I was sleeping on a pull out couch, I felt something crinkly and I found plastic wrapped around the full matrice (under the sheets). I was wondering...

a.) Why do they put the plastic on there (is it to protect the matrice from getting soiled?).

b.) Can you take it off?

Answer 1

we took mine off and its fine

its probably there to keep it clean case a kid sleeps on it and has an accident