Ordered a Large Size, looks too big according to my wife, returned and ordered a Medium! Perfect fit for a layer. Its warm! I wear it under my work clothes and it perfectly blends in, except for the Zipper, the do stand out. Wish they would use a Black YKK zipper. I am happy with my purchase. Buying the Vest Next! Light and Warm!

Note: The zipper is YKK, tough and high quality Zippers! Will be posting more reviews if I really put it to work.