I have a bunch of those Ikea bibs. I think they work great. And no, I don't iron them. I have the exact bibs pictured in the link and haven't had any problems with them (but DS isn't too messy nowadays). I also had some older Ikea bibs that sometimes leaked through. But DS is older now, and doesn't spill too much on the bib. I think they're more water resistant than waterproof. So if he spills a bit of liquid, it doesn't go through, but if he were to soak it, his shirt might get wet. Either way, I love how they are long sleeved.