Anyone tried these?

Yeah, my ankles have been weakened just by one silly accident sprain on each of them (separate times) and they can get sore on longer rides.
 
I've tried them & didn't like them. Felt like they added a extra layer of instability to my seat. But to qualify, I was trying them for comfort as I returned to riding after a back injury. I haven't tried them again, now I'm better.
 
newrider.com