I've been using 100% cotton flannel and some fleece. I just started making these a few weeks ago, just in time for my last cycle

I started out with a pattern I found online, but it was an odd shape and it wasn't working for me. So I traced one of my old sposie pads (Stayfree something or other I think) and just made a few that looked like my old ones, with 3 layers of flannel and a layer of fleece. Very trim and comfy and absorbent.
Then I took the same pattern and added wings and made some pocket pads, and some AIO's with velcro on the wings. I've heard some gals say that the velcro chafes, but I'm using some little round velcro tabs that are maybe 1/2" and haven't had any probs.
I don't have a serger and I'm too lazy to T&T, so for the inserts I just did a very tight zigzag stitch and then trimmed close to the edge. I've washed some of them a few times now and haven't had any fraying or anything.