I purchased 2-1/2 yards of rubber sheeting (to make two) which is cotton fabric with rubber in the middle that makes it waterproof. Then I purchased 2-1/2 yards EACH of two different flannel patterns to cover the rubber sheeting (I chose dark fabric for obvious reasons.)
I will show you more about the assembly soon when I make the second mat. I whipped this one up yesterday and I'm hoping that my being prepared will ward off the flu for a long time so I won't actually have to use it! Here's to hoping!
One last thing- of course, I plan to make a few extra pillowcases as well!