My feet always seem to be somewhat stiff, despite exercise, rest, soaking in warm Epsom salts, etc.. These things all help a bit, but when I'm in a flare (like now!), there's not much improvement. I think, too, that my neuro condition and high arches are part of the problem.
I have a pair of microwavable (non-walking) "slippers" my son bought me some years back. I love them when I get a flare and my feet act up. I take a few minutes throughout the day to microwave them and just sit with my feet in them while I read, sew, etc..
This morning, I discovered that because the slippers are so nice and thick and because I heated them, it's so much easier to "exercise" my touchy feet, without any cramping! I put my feet inside and push my feet into the ground, move them back and forth, and sort of give them a massage without even touching them. My feet now feel better than they have in a long, long time.
It didn't take long for them to loosen up. I decided to say my morning Rosary while I had the slippers on, so maybe this was a bit of divine inspiration.
Sorry I don't even know what brand the slippers are, but in looking online, they seem a lot like the Herbal Concepts Herbal Slippers. I don't know if it's the same material inside, but it sounds very similar.
Anyway, just thought I'd pass that along. I think foot issues are my most irritating fibro problem. Hope it helps someone else, too, and that everyone has a good day!