Always in my bag of tricks.
This jacket is one of the ten or so things that I always have with me on commutes, it's SUPER lightweight and packable, I keep mine rolled up like a fatty Cheech and Chong spliff tucked into the edge of my bag. It holds heat like cast iron and fights off water dustings and mist like a champ. I wish it had pit-zips for venting, and it does get a little flappy in the wind or when your screaming through a straight due to (not much) excess material and the nature of the fabric I suppose. It's very thin, I sport the white with the sexy red trim and it's translucent.
I'm 6'4" 180 lbs and the Large fits me perfectly, the sleeves are an adequate length as is the body, I like my cycling garments a tad bit longer in the body and this little guy nails it.