sprenger system 4 stirrups
I just bought these. they are not cheap by a long shot, but I thought that if they helped my knees as well as improving my leg position, then they were worth a shot. I LOVE them...my knees feel great, my ankles too! They definetly help keep your ankles in the correct position without too much strain . But I have only ridden with them a few times, so I don't know how they will hold up. I'm keeping my fingers crossed, though!!