This jacket is incredibly light. It comes with a stuff sack that seems to be made out of the same material as the jacket. It is feather light. I wore it at camp in the morning and nights, with only a base layer underneath. The temperature was in the mid-to-high 30's and low 40's. I stayed very comfortable. No complaints what so ever from this product. Mont-Bell hit the nail on the head with this one.

This is one of the best investments of all my gear! It runs a little short on length, so you may not wanna wear it "out and about". I'd recommend going up a size with this. For 20 degree weather all I need is a shirt underneath and this and I'm good. For windy days or rain use this bad boy under a waterproof layer/jacket and your good to go! Packs away into a small stuff sack, saving you a lot of room and weight. You'll think twice about packing a bulky fleece when you have this as an option. You will not be disappointed.

I got this jacket as an insulation piece for a long term hike starting Feb. However, I went snowboarding and I left my gear at my parents house so I used this. I had this jacket, a waterproof shell, and a simple cotton long sleeve shirt on and was WARM even at 14 degrees F. If I laid in the snow without moving for an hour I am sure I would have gotten cold, but I was very happy and even surprised with the amount of warmth. Incredibly light weight, isn't bulky but is a little puffy (which gives enough dead space to keep you warm.)A few feathers have come out but that would happen with any down item I presume. The only one semi small issue I have is there are no pockets. That is fine since I would use it as insulation underneath something anyway.

Super light, warmer than you would think based on weight (5.7oz.) The medium fit my 5'10", 160lb. frame perfectly with enough room for a mid to exp. weight base layer. Length is fairly short but that's the way I like it. Do be careful around campfires and overhanging branches though as this seems to be a fragile jacket (actually, I would call this a sweater). Who needs pockets anyway. A great garment as I continue my quest to lighten my load in the woods. Top shelf MontBell!

Outstanding jacket and good value. It weighs (and packs to) almost nothing and kept me warm on a trip to the Alps with temps in the 20's. Pair this with a lightweight waterproof shell and you probably won't need anything else for most endeavors.

Fist things first, I an not a sedentary nor skinny guy and I keep my metabolism up if possible.

My test run was with two layers of IceBreakers and this down jacket.

That said, I took the jacket out for a whorl, it was about 7 C or 45 F. It was so light I hardly knew of it. It broke a hard wind around me, and twas extremely comfortable.

The temperature dropped to near 0 and after driving 20 miles I noticed I didn't have any heat in the car. The only reason I noticed this is because I did not have my down shoes on. "/

The color red does draw the attention of those in camouflage, those on harleys and depraved womem all smiling sharply as I walked by.

Super light, unnaturally warm, durable, windproof, packs down to a softball. This jacket is just retarted.

they appear to have shaved an ounce off of their previously light weight jacket....this one is down to 5.7 oz! No pockets, no frills...perfect for winter desert belays or Canadian Rockies summer belays....of course you would not want to try and climb in it....I love the weight in terms of strapping its self contained bag to my harness, would also consider it a mid layer ski and ice climbing opt.

I'm 6'1" ~155lbs (an athletic build in other words) and the medium was a perfect fit.

This jacket is a revelation - weight, including the stuffsack, was an even 5.7oz on my digital scales after a couple of moderate trips. How often does an item measure up so exactly? It's warm as can be - temperatures close to freezing and I was still warm as toast at camp. When compared next to my old zip neck thermal L/S top - it's nearly half the weight for multiple times the warmth. This jacket is a no brainer for those wanting freedom from weight.

i'm reviewing the men's but i have the exact same jacket for myself in women's. we live in EXTREME cold and need any advantage we can get. this jacket's superlight/superthin yet warm qualities are goign to be a stellar leg up. it will fit under anything without bulk. wore it recently during a freak snow at 12,000 feet under a windstop fleece and was nice and toasty.