After plenty of track time wearing a back/chest protector (The forcefield from Johnston Leather)
http://johnsonleather.com/forcefield_back_protector.htm I think more and more about wearing it on the street under my leathers or aerostich. I haven't worn it yet on the street, but I'm very close to wearing it soon on the street.
I'm wondering if anyone else is using track level back protection on the street, and if so, what are you wearing.