lay it out flat and put anything heavy in the corners then in the centers of the outside edges to hold it in place but not too close to the edge. Leave enough space between the weight objects and the edges so you can either cut with scissors or slide your cutting mat very gently under the fleece and use your rotary cutter. I hope this helps. Good Luck, fleece and minky have the same characteristics for stretching easily. This is how I did the backing for a minky quilt but after I got it laid out flat I used a wash a way marker and a long ruler to mark a straight edge all around for cutting and used scissors not my rotary cutter. This was not my idea but the lady who owned the quilt store suggested it and it worked great. I was getting the minky so stretched out of shape I was not sure if there was any hope for it but this really worked for me.

Good idea! Thanks.

The rulers I use for cutting fleece, cotton - any fabric - are sprayed with basting spray. At first it is too sticky, so I immediately used some backing scraps to rub excess basting spray off. The ruler holds firm to the fabric. Eventually, the basting spray wears off, so then I just repeat the process.

But I really like Quilting Cats idea!

I have 2 of these, one quite large that I use. It works well, but is getting old like me, and don't know if I can find another. Do fabric stores still sell these? (Another retired Math teacher here!:)