I am considering changing my insulation layer (for 3 season conditions) from down to synthetic. I currently have a Montbell UL Down Inner parka which has served me well but which I have restricted to an in-camp or sleep layer due to the fact that it is down and I don't want to get it wet by hiking in it. The parka weighs 9.75 ounces on my scale. While hiking, I normally wear a long sleeve micro weight smartwool layer and supplement with a wind shirt (Patagonia Houdini) when temps get down into the 40s. Below 40, or even in the 40s when hiking but not exerting myself (long downhills), a mid insulation layer would be nice. But I won't hardly ever use my down parka for that.
I came across the Montbell Thermawrap sports vest as I do some research on synthetic pieces. At an advertised weight of 6.6 ounces, I could save 3 ounces but that isn't my main motivation. I just want a more versatile piece that I can use while hiking and while in camp. But I'm not sure whether this vest will keep me as warm as the parka while in camp. Probably not given the lack of sleeves. And not sure how it would perform to supplement my sleep system when called for.
So any experience that could be shared regarding this vest or similar vests would be helpful. There is a jacket version of this product but it weighs more than my down parka and I don't really want to add weight.