The fabric of this vest is thin and does not insulate as well as Polartec.  However, it looks nice and is OK for moderately cold weather.  The fit is snug.  On the 2nd day I wore the vest, a 5-6" pice of one of the side seams opened .  All seams are double stitched, except two - under each arm.  It was a single stitched seam that opened up and you could see that the stitching was sloppily done.  I can stitch it up myself, but it won't look as good as the original.