Great jacket. Slim fit. I'm 6'3", 225 and the XXL fits great. I wear an XL in Patagonia. XL or XXL in Arcteryx. Feels like there is more down in the sleeves and back than the down sweater, which is a huge plus.

Dont love the hood, but everything else is great. When I zip up the neck but don't wear the hood, it is uncomfortably tight around my neck.

I am a big fan of this Rab jacket, and hope to wear the thing into the dirt. First the pro’s:
-Lightweight
-Quite warm (worn down to -5 degrees F with just a single long sleeve layer underneath while walking)
-Very windproof
-Helmet friendly hood (BD Half-dome underneath)
-Fit: front is harness-friendly, back is cut a tad lower down so it fits nicely, harness or sans-harness
-Durable Pertex
-Responsibly sourced Down (http://responsibledown.org/)
And really only two con’s:
-The hand pockets leave a bit to be desired. The cut allow the hand to go to the very bottom of the jacket, which reduces the warmth a bit.
-I would prefer a slightly beefier area where the zipper meets the small pocket that holds the zipper near the chin when fully zipped up and the hatches are battened all the way down, though the microfiber fleece in that area on the inside of the coat is nice

READ THE REVIEWS CAREFULLY - after writing my review and re-reading over these reviews, some of these high ratings still complain about fitment issues, yet still "Love it". This does not fit true to size or even one-size up in terms of armpit fit and comfort.

Absolutely in love with the Rab brand, yet I was very disappointed in the armhole placement on these jackets, they run up into your armpit. You do not notice it so much when you first try it on.

The Medium was my first choice and yes it is a very slim fit, yet overall it fit comfortably....and I was happy until I ran a 30 minute errand, which had me taking it off and reordering a Large due to the armholes cutting into my armpit very noticeably.

The Large came and it was much more large/longer in every other place and felt like a much different jacket overall - a marshmallow sensation that ballooned my figure and swallowed my arm length.

I still wanted to keep it, and I ended up with the same feeling within a day of using it, the armhole placement is bothersome, not something that is acceptable for any brand, especially at this price point.

And it is certainly not my shape or size or whatever you want to possibly excuse it on, I am athletic yet very lean... I am a TRUE MEDIUM in outwear. I usually have plenty of room in my slim tees and dress shirts, otherwise I would have NO clothes in my closet to wear! And that's FAR from the case.

This is purely an example of what I believe to be cheap armhole placement. In other terms if you really want to get this jacket in alpine conditions with layering required, you would likely have to double your normal sizing to feel adequately comfortable.

So I should say that the quality seems great. That said, I love the fit of Rab shirts and saw that some feel this is a slim fit. I found it (and several other mid and outer layer Rab products) to be short and wide.

I was looking for a jacket warmer then those light-weight ones w/o down. Bought a Beluga size M after exhaustive research. Just what I need. Love the color, quality, and especially the fit. Tried many other brands, and I would say if you care about the fit like I do, and don't want to look bulky when wearing such a jacket, this Microlight Alpine is definitely something hard to beat. I feel size medium runs snug , but not small. You are not getting as much room inside the jacket but for me that's still sufficient.

I just love RAB gear and this is the greatest down jacket i ever test it.

Incredibly light, very warm and works great as an outerlayer, very wind resistant. I haven't taken this thing off since I got it. My only complaint is the short hem (meant to avoid climbing harness) which can leave your waist slightly exposed. The large fits my skinny frame perfectly and still allows for a midlayer.

I've worn this with a fleece midlayer on Mt. Washington in January (10 deg F, 50 mph winds) and was comfortable while idle on the summit for 20 minutes. Around town with a button down can handle about 25 deg F. Great hood with drawcord and moldable wire in the brim but I haven't tried it with a helmet. Packs down to nothing.

My wife bought me this jacket. I like its red color. It's very light, and keeps me warm in the cold days. This jacket is really true to size, fit me perfectly. It is also very stylish. I don't have any problem with the feather falling out of the jacket.
Backcountry.com customer service reps are excellent. I strongly recommend this website.

Would have given it 5 stars, it's light, packs down small, very warm, hood with flexible wire in visor. Great range of movement without it riding up or the sleeves becoming too short. Only negative is the zipper is on the wrong side, it's backwards. Almost like it's made for a lefty. Bought it over the summer on sale and figured it would be fine. Definitely takes some getting used to. Maybe it's normal from the part of the world where it's made but it's like driving a right hand drive car in the USA. Once you get it started, it's fine but it's just strange and kind of inconvenient.