You might want to look at Zilco Harness. Started for the racetrack (made in
New Zealand), it is now used by Combined Driving Eventers. It is much
softer (the parts that contact the horse) than is Biothane. You might want
to call Letty's in Holland 31 318 522 840 for more information or the name
of a dealer near you.
Barbara (Who can't wait to get the FULL Zilco harness) and Larca (the 14:3
Arab whose brain pan is SOOO big we had to get a Zilco browband made for the
BIG warmbloods)