I ordered this in anticipation of a trip abroad where the temperature will change widely during the day. This jacket is incredibly lightweight. In fact, it took a while for my brain to realize that even though it felt like I was wearing nothing, I was warm! Be aware of the sizing. I am a pretty solid medium in most things (5' 7", 160 lbs) but this runs a bit small. The large fits very well.
This review was written in the old system and had content requirements that are different than reviews written today.