My Tennessean isn't wide enough so the hunt is on again. 3" below his withers he measures 11.5 or 12". A Halflinger won't work because it doesn't have enough rocker-built for the flatter backed horse. Drafts are too big for me and too long for the horse. I'd really prefer used. If anyone is looking for a leather/cordura Endurance, mine is for sale. I bot' it used, set it on him and it wouldn't even begin to settle down into place. This will work with horses other than gaited. Seat is 15.5"