Hi newby here! I am an amp BK trying to help my "Leg Guy" help another patient. We have both seen a product that allegedly allows you to remain UPRIGHT while seated on something like a bicycle seat, it has some sort of upper arm "steering"---we THOUGHT it was called the "Sim Leg". I cannot find anything with that name or anything like it. This is NOT any sort of RollerAid or Leg Caddy, and it is not the iWalkFree either as far as I can tell. it purports to allow you to "walk" while perched on the seat. I know someone I did PT with a while back gave me a brochure for it but I don't have the balance and besides I already HAVE a perfectly good titanium and carbon fiber leg! If anyone has or knows what this product is or what it might be called I would greatly appreciate hearing from you!