It works great. I have one and a windstopper/wool sweater I wear under my outer garments. I like the "under garment" philosophy, as it allows you to be versitle with your outer camo patterns. I am up in the Lake Superior snow belt of Wisconsin and weather can get pretty nasty, and can change without notice. I can go from traditional camo, to my fleece snow camo when the weather changes quickly, and still be toasty underneath.

I highly recommend it.