Looking at changing my stirrups, as finding my Bow Balance are bit too flexible. Ideally a reasonably wide tread, and wonky/creaky ankle gets sore after a while in bent leg stirrups, so something with some flex might be helpful too.
I use Heather Moffett Wide tread stirrups https://www.hmsaddles.com/products/hm-stirrup-irons which I find much more comfortable and supportive than the flexi ones for my mashed up ankle. I have wrangled cages onto mine for added security as I ride mostly over rough ground.
Would like to follow this. I have Sprenger flexi stirrups at the moment which have completely stopped my knees from hurting but my dodgy ankle still hurts. It feels like it pops out and like it will break if I try to move it!