My favorite warm pullover is a high orange viz polar fleece. I started wearing it because I got it for free from my work but now I wear it as first choice. It's a lot more important for me to wear high viz going to work (crossings etc) than it is if I am at work. One does wonder however, if everyone was wearing high viz, would it be any use? I guess not everyone would wear high viz, so that discussion is pointless. For instance, some of the population are highly focused on their appearance so it will probably always be an advantage for me to wear high viz.