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I would think that fleece might mat down and maybe melt somewhat, you might try using a press cloth so the iron is not in direct contact with the fleece.

when i iron anything that I am afraid will melt I always put a hand towel between it & the cloth (this case the fleece) then I start kinda low & turn it up as needed (it will need to be warm enough to heat through the towel to the fleece, but it works well, since it is a less direct heat

Take a scrap and see if it melts.

I would turn it on low and then gradually increase the heat. If you have any scraps left over you can test on them.

Does your iron have specified settings? My iron has specified settings for the different kinds of fabrics. I'm not sure where fleece lands, but here's what mine says from hottest to coolest: linen, cotton, wool, rayon, silk, acrylic.

I always put it on the highest as I usually sew with cotton. I agree that pressing seams is WAY better!! I'll press anything I can!

Try it on polyester or low and go up a tiny amount if it doesn't work like it should. It will melt but since it can be washed and dried it can take some heat, a dryer is not touching the fabric so it's somewhat different but it still can take some direct heat. With fleece I wouldn't iron it anyway though. And my iron is my second most important sewing tool.

polar fleece is plastic, so yes, you are right, it will melt if the iron is too hot. I would put it on its lowest setting.

Use a fabric scrap to test for heat. Start with the lowest heat available on the iron and see if it holds a crease. Keep going up until you hit that "sweet spot" of enough heat to press correctly without melting. Good luck!

I wouldn't iron fleece at all and it probably won't matter in most places. If you really need one place to say in one direction you can hand baste it if necessary.

Try ironing the backside of the fabric instead. On some fabrics, you'll hafta iron the backside. I've never ironed fleece but I imagine it Would melt if ironed on the frontside. Try it on a scrap piece first or else just wait til you're finished & either hang it in the hot steamy shower or wash & hang dry. Hope this helps, good luck!

To press doesn't necessarily have to mean to iron. You definitely shouldn't iron fleece, even on a low setting...but you can "press" it all the same. Press it out, get a heavy book, and sit it on top of your seam for awhile. Stand on the book, do whatever...pressure works, believe me. I hate to iron, love to sew, and often would rather leave a project "pressed" overnight than pull out an ironing board, iron, extension cord, blah blah blah...and then, I have an irrational fear of irons and burns. :)

I wouldn't press it, there are a couple of things you can do. If it needs to stay inplace while you sew it and that is why they are saying to iron, you can use glue stick. if it's to press seams open I wouldn't worry or finger press them open. An Iron cool enough to not burn it won't really iron it either.. If you want to tell me the pattern info in a pm I can take a look online at it. Some of the patterns have been around before fleece :-).

Good suggestions about the scraps! My iron tends to have two settings, really cool and blazing hot....So I think in those terms