I bought two Salem mats at the AQS Quilt Show recently. I got the 12" rotating mat and a 15" x 22". So far Im pleased. They do get the cutting lines like any other mat, though. At the show, I did notice the larger mats rolled up into about a 6 to 8 inch diameter. I would think you could lay one out with the right side down and that it would eventually flatten out.