The hybrid jacket is officially a mainstream thorax cover. Seems like you see them everywhere, and every company has one. The Outdoor Research Acetylene, the original jackalope of a jacket, half vest, half shirt, is still one of the best.
The Acetylene is basically a fleece jacket with 60 grams of PrimaLoft Eco synthetic fill quilted onto the front of the body. You get warmth where you need it on the front of your core, wrapping slightly around the hips, and lighter insulation everywhere else. The fleece is a low-pile grid on the inside and a nice flat exterior that will shed snow easily. It's even treated with a silver-based compound to control odors.
The outside features two zipped hand pockets and a zipped chest pocket, and there is a hem drawcord. The sleeves are cut long and feature nifty concealed thumbholes. The fit is trim, making the Acetylene a very easy and effective layering piece. You won't want to hide it too often though; the overall effect of the color and design is very classy, so you can lord it over your dirtbag outdoor buddies.