Help! I am in the process of getting a round pen ....but I seen a site (roundpenaz.net) for panels made out of seat belt material. It is flexible so if the horse runs into it they will not get hurt. Has anyone worked with such a round pen or know of anyone who has. Did you like it & was it as strong as they say it is supposed to be? It sounds good in theory....but we all know how THAT goes right?