You have a down jacket that you will be hunting in? Whats the shell made from? Most that I see are a nylon or other waterproof material that is fairly noisy. I also don't wear an arm guard during the September archery seasons but I also hunt between 2500' and 6000'. Not like some of the elevations you can encounter in Colorado. I don't know how high you will be hunting but if it's cold enough to need a down jacket I would be looking into wool outer layers or fleece. Unless your down jacket is quite than forget what I said.