I've had several Patagonia down jackets before and they are just the best. No exception this time. I wish it was helmet compatible though.

Gave it as a gift, but he loves this jacket. The weight to warmth ratio is unparalleled. Always pack a puffy with you just in case.

Best gear!! In doubt? Buy! Using it very day! Will last and fulfill your demands!!

I've had this jacket over the past Fall/Winter/Spring and I'm pretty sure I've worn it 80% of the days since then. I've taken it camping, climbing, hiking, snowboarding, and worn it every other day around town. It's a great mid-layer for brisk Midwest winter days, and fantastic standalone for cold Fall and Spring days. It's got enough room to throw a a couple layers under it but compact enough for throwing a heavy duty jacket over it. The hood is also a lifesaver for windy days. It will keep you dry under mild rain, but I would definitely recommend a rain shell for especially rainy situations.

I've put a couple campfire sparks thru it and the zipper caught and ripped the inside a bit, but this has all been solved with some Tendentious Tape, I would highly recommend getting some sort of gear repair patches, because you will put a hole in it at some point, and it's super easy to patch.

I've had this for a couple of years now, and it is still going strong. I've taken it hiking, climbing, backpacking, travelling internationally and just wearing it around town. I'm in the PNW so winds and rain are pretty common, and winter temps are fairly moderate unless you're in the mountains.

In my opinion this is a great 3 season piece. I take good care of my things but have definitely crammed it in a lot of packs and snagged it on rocks and it's held up well, and despite lots of compression I haven't noticed much decrease in warmth over the years.

It holds up well in the rain, both in water resistance and in loft and blocks wind fairly well, while still being pretty breathable. I hike fairly hot so will still get swampy in this unless it's say, summit day at Mt. Baker and it's cold and windy AF.

It fits well though I could use a bit more length and/or a two way zipper for some extra length. I'm just over 6 ft and hover around 190-200 lbs and the M fits me well. Can't layer too much underneath but works as a great midlayer with a soft or hardshell too.

Unless I'm very active or it's above say 40, I'll want more layers or a heftier jacket.

The hood fits over a helmet though a bit on the snug side. No complaints really.

I might like this jacket too much.. I try to wear it in extreme conditions like -25 windchill (15+mph winds).. it doesn't work that well for that but usually @ 15degrees F with little wind or no wind I'm still in a t-shirt and I'm pretty warm with the hood up.
I wear this 90% of the winter and I brought it to the BWCA for a 4 day trip in late Sept, packs very well the hood is indispensable and the main reason I bought it, the hood hands down is the best feature but packsize is a close second. I'm pretty sure I'm going to get another one just to have it in case PATA gets some crazy ideas on changing it. true to my size I got an L I'm 195lbs I can layer a bit with some room to spare I usually don't need to. below 20f with some wind (above 10 mph) a t-shirt isn't enough for an extended period of time. If you need something lightweight for those trips where the temps can very from day to night by 40-50 degrees this works well, its not a winter coat but to and from work it's still pretty good.

the nano puff jacket is the best jacket i've ever owned - so lightweight and warm at the same time. you can wear this on really cold days and on cool days. throw a shell over this when it is raining and you are going to be cozy and dry. fits really nice considering it's not a slim fitting jacket.

This is a great mid layer or fall/spring jacket when you have warm days but the nights can get somewhat brisk. Its a relatively thin synthetic down that can be worn comfortably underneath a jacket for skiing/snowboarding and packs down nicely for a backcountry adventure or travel. I've had mine for 3 years now, and I've worn it nearly every day for two winters straight.

Pros
1) Light weight
2) synthetic (continues to insulate when wet)
3) Packable (packs down into its own chest pocket)
4) Discrete chest pocket
5) Cinch cord at the waist
6) Packable

Cons

1) Regular fit (I prefer a slimmer fit for mid layers)

The amount of warmth that this thing provides is amazing especially with how light weight it is. I use this all the time split boarding and often get to hot even in this on the ascent. I wear it around town all the time too!

This jacket is perfect. It looks great and is light and versatile. My (picky) son loves it!

My husband was looking for a warm but not super puffy outer layer. He was tired of wearing more than three or four layers in order to stay warm outside. After some discussions with friends and family, and research online, we decided on Patagonia. We chose this jacket based on its excellent reviews, and this particular one with the hood because we live in Seattle and there is often a drizzle or light rainfall in the autumn and winter months. The navy blue color in size small was on sale the day after Thanksgiving, so we jumped on it right away. It arrived within two business days because we have ShopRunner. It keeps him warm and cozy, and he loves the hood. When it's super cold in Seattle (below 35 degrees), he wears a fleece underneath. Now I want one for myself! Note: the sizes I put for measurements along with this review are for my husband.

This jacket is great for all activities. It's light, packable, breathable, weather resilient and surprisingly warm. I generally use it as an outer layer and with only a t-shirt I'm comfortable down to low 30's. Fitted hood is key as well. This thing really traps in the warmth.

Like all the Patagonia gear I own, this piece doesn't disappoint. If I were using it strictly as a layering piece, I would've bought a small, but for cruising around town the medium is just right. This jacket is perfect for SLC and I use it almost every day.

Jacket keeps you warm and dry, looks good, hood could use some work.

So I bought this jacket as a gift for my sister's boyfriend, and I have had several myself over the years.
It is a phenomenal purchase, works great for layering systems as well as an outer layer on warmer ski days. I love the aspect of the hood, especially if I am camping and don't have other layers with a hood, that really helps retain body heat in winter camping settings.
I found that it runs true to size, and that it depends if you want it to be a mid layer or a base layer, so depending on your layering system the size you are looking for could vary.
This jacket is also great for casual wear around town and everything like that, it is one of those trendy items out on the market right now as well. But if you are looking to use it in the backcountry it definitely serves that purpose as well!
It is quite warm for a puffy, but over time if you wash it too frequently the down looses some of its heating properties, so be aware of that.

I've owned a Nano puff jacket myself for about 5 years, I've put it through a lot, it has a bunch of holes in it yet it still keeps me warm. I've used it on many alpine climbs and it has been awesome, might be time for another one. Anyway, I bought the hooded version for one of my cousins this year as a Christmas present. He lives in California and says the Nano Puff keeps him perfectly warm in No. Cali winter so far! This is a lightweight, versatile piece that will work for anyone.

If you're familiar with Patagonia, you'll appreciate the fit. Hugs pretty tight, true to size. This one has just a bit more length in the sleeves than other Patagonia gear. Great warmth for anything above 40 degrees and it actually repels water pretty well for short periods of time. The hood works well for under helmet but be warned, you probably won't wear it walking down the street or in a more casual context. Great layering jacket so far and very versatile.

Primarily use this as a layering piece while snowboarding. Warm and fits well, it's basically a staple piece for me. Would recommend.

I love my ladies version of the nano puff, so I decided to get my brother one for his birthday. He was absolutely thrilled, and has been wearing it nearly every day in the Montana fall and early winter. This jacket is great for cooler days, but not quite enough on the coldest days in the mountains. I like to wear mine under a shell on really cold days of skiing. I bought him the classic grey in size L, and he said it fit perfectly.