Arthur van der Pluym wrote a review of Marmot Variant Insulated Jacket - Men's on February 27, 2012
This is the most versitile jackets i have ever worn.
I've used this for running in winter time, ice climbing, mountaineering, as insulation layer in the winter with nothing else but a gore tex shell. because the back is not insulated you wont sweat but you wont freeze either, because the front keeps your body up to temp. note that this jacket is best used for excercise, not so much for standing still and poking in your nose
This jacket is not really made for skinny people, if you're a big guy with a lot of muscles this is a perfect fit for you