Awesome jacket and I liked the first one I bought so much I bought another...! Super light, super comfortable (with a very soft and  relaxed polyester nylon type material that is used both inside and out) and super warm for it's weight...! Tons of pockets on the inside to accomodate, phone, sunglasses, even a pocket for lip balm... slips on and off with absolute ease...! The stand up collar is lined in a very soft fleece material that feels very nice on your neck, as opposed to many other puffer type jackets that are just nylon lined... The fit is just right to allow a layer of a light fleece vest or a sweater... I personally prefer a jacket with a little space for layering but one that fits fine just over a sweatshirt or flannel and for me this jacket is perfect... I am 5'8" and 180lbs, 43' chest and a bit stocky and I wear a large.... If you really like tight fitting clothing then maybe consider down sizing... If you check out the fill of this jacket which is Primaloft you will find it is rated the warmest of man made insulations and when you wear it you'll understand why... EXOFFICIO does not make this jacket anymore so Iwould highly recommend this jacket for a very light but warm winter jacket while you can still get one.... As info the list price of the jacket is $150 so anything less is a good deal...