I gave it a 5 on warmth but remember this replaces a mid weight sweatshirt by design and in that respect it works very well without the weight. I was out in a light rain and it shed water very well, but it was a mild light rain not a real test like a heavy rain fall. It is - much lighter and more packable and faster drying than the afore mentioned sweatshirt. I comes with a stuff sack but other than a curious how small can I make it session I have not used the stuff sack. It will stuff down to a nice small package fairly easily. I'm 5' 10, roughly 215 lbs and the XL fits perfectly with space for a cotton button up shirt underneath.In lower temperatures, or strong cold winds, use as a mid-layer/warming layer under a shell or insulated jacket, it provides exceptional additional warmth.This is an outstanding value for the price with good versatility. Initially unpacking there was a chemical oder, but a couple hours in a light breeze and sunshine removed the issue. Seriously considering purchasing a second for the emergency bag in my wife's car. Very pleased.
Rating: [4 of 5 Stars!]