The thinner battings are sooo much easier to piece. Warm and natural is easy just but the edges to gether and zig zag. Fat bat ... the really high loft is a bit harder. I typically just hand baste them by butting the edges. On the fat bats the presser foot always seems to find its way into the batting. I have tried the paper over the top to prevent the foot from digging into the batting , but was not happy with the results. The stitch compressed the batting too much. Hand basting the Fat battings did not take too long since you can use large sloppy stitches since no one will ever see them.