www.thinlineinc.com

these are all the rage in the states. seems they are now in tack shops in the uk. has anyone used one?

Never have but I hear they are really good and many riders swear by them.

Well, Even tough no-one replied I just have to report I purchased one and my horse just loves it! It does all they say it does: helps me to sit, keeps my horse more supple and round. Amazing little thing. Anyone reading this, I highly recommend them!