This 17 3/4" x 24" pressing sheet is my favorite. It is a slick, Teflon coated fiberglass that was designed to be used with fusible web, especially Misty Fuse. I use it with Wonder Fuse and it is amazing.
NOTE: The Big Goddess Sheet instructions say not to fold it, but I do and have not had a problem doing so. And we have to fold it to ship it because that's what fits our shipping packages so if you order one, it will come folded.