I picked up a BMW Airflow 4 jacket and pants over the Summer. It's my first foray into BMW gear and I gotta say I am completely sold on the quality and functionality, nicest stuff I've ever had. I expected them to work well in the hot temps of summer and they did not disappoint but I did a little experiment a couple nights ago to see how they did in the mid-50's and they were surprisingly good. I have an Aeroflow shield on my 1150GS and I know that helps but overall I was comfortable. I don't ride year round here in Shitcago but definitely do up until around mid-December and it got me thinking that I could get away with using the Airflow 4 gear if I had a very thin windproof base layer under it. Any suggestions?