I used the press and seal to wrap the heating pad under the frame like the photo of Bees'. ( I just laid the pad under and wrapped up the whole frame to hold it in place). I've used a very thin towel and it's all wrapped up. Let's see what the temps reach in an hour. 
Maybe hay on top would help insulate more?? I don't usually use hay with newborns?

Maybe hay on top would help insulate more?? I don't usually use hay with newborns?