Our Wal-mart has two types one is very thin and the other is much thicker. I have uses the thicker white on a king quilt this summer and it worked out just fine. I have used the thinner type for foundation piecing. I have also gotten the unbleached type for a quilt project where everyone used fabric markers and made their own quilt block. I put them together and used it for the back of a quilt I made for a family reunion. Turned out great.