Patagonia Nano Air Light Hoody: the fleece killer

Back when I reviewed outdoor gear professionally, which is to say I regularly got stuff for free and was paid for writing about it, and is not to say that ever amounted to a sustainable living, trips like this were as rare as they were lusted after.  Outings where conditions were so bad, so consistently harsh, that every detail of your protection was made plain; bad, good, and in between.  In even harsh climates it’s as tough to find these trips as it is people who can both make a living from gear writing and keep their integrity.   This rare, I’ve come to realize, regardless of context.  There’s a ceiling for honest gear reviews, directly related to number of days in the field.  Shortcutting knowledge from experience is impossible, but not all days bring equal learning, and there’s little better for learning about midlayers and insulation than 72 consecutive hours of cold rain.  I’ve contemplated how many legit reviews one person could do in 365 days, and without a big travel budget to jump around to different, differently bad climatic episodes the answer is, not very many.
Screen Shot 2017-09-21 at 4.09.23 PMIn Montana 2017 brought the warmest July on record, and a summer that went from mid-June to early September without meaningful rain, localized thunderstorms only.  These scorching months turned the abundant grass of a deep winter and wet spring into tinder, and the irony of a big winter birthing an epic fire season was as deep as my biggest hunting trip of the year coinciding with an early stretch of deeply autumnal precipitation.  I got soaked for three days, put my plan B for access into effect to avoid impassible muddy roads, ripped the derailleur off my bike anyway, and upon return spent hours in the yard hosing off everything; from rifle scope to backpack to packraft.  Thankfully I found animals when the sun finally appeared, and thankfully I had on a whim brought along my brand new Patagonia Nano Air Light Hoody, which proved to be the best wet weather midlayer I’ve ever used, by a large margin.

I’ve written a bit about the modern trend of active insulation; synthetic fills whose attributes and construction allows for breathable shell and liner fabrics.  Up to this point my conclusion had been that while these garments have done a good thing in complicating the insulation conversation beyond merely equating high R-values with best warmth, at best they came close to approximating the function of fleece plus windshell in a streamlined and potentially more user-friendly package.  As recently as this spring I didn’t see them as likely to function better than fleece in difficult conditions.

I was wrong.  When Steve House says it’s one of the best things Patagonia has ever made, he is in no way kidding.  The Nano Air Light Hoody outperforms every type of fleece I’ve ever used, in every way about which I am thus far qualified to comment.  It’s a joy to see a company whose activism and heritage so often contrasts with the frumpy plaids that pay the bills make such a forward-thinking, no-holds-barred technical piece.  One whose full value is probably all but impossible to explain to the casual consumer, who feeds the increasingly fat beast which is the outdoor industry.

I wore the Nano Air Light Hoody for 100 hours almost straight last week; while hiking, glassing for hours under a tree, sleeping under a damp mid, cooking and waiting out downpours in the same tent, packrafting in 20 mph winds, mountain biking, and carrying 90 pounds of meat and gear 6 miles up a big hill.  I had it off for 2 total hours, when the warmest and sunniest hours of the weekend thankfully happened to coincide with the time I was butchering and doing the initial packout of my sheep.  The Light Hoody was warm under a rain coat while stationary, cuddly inside a sleeping bag, breathable under the same rain coat while hiking, and dried in a way which was nothing short of astonishing.  Islands of moisture within midlayers (indeed, all layers) are a small thing that can make for big misery during sustained wet weather, when you have nothing more than body heat and the occasional hot water bottle to dry things out.  The Light Hoody has virtually none, only the cuffs hold moisture and dry slower than the rest of the jacket, and they do every well for something with 12% spandex.  Adding and subtracting layers in the rain is always problematic, but being able to spend a day hunting in 50 degree rain, wearing the same three upper body garments with no more concession for activity than adjusting zippers and hoods breaks all the rules, but the Light Hoody made it happen.
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Construction makes almost as big a difference here as materials.  Patagonia claims the shell of the Light Hoody at 70 CFM (cubic feet per minute), which is massively breathable, almost enough that it should be useless.  And the Light Hoody doesn’t block the wind in a way most would understand, rather it vaguely mediates how much wind reaches your core.  This allows the Light Hoody to dry fast, faster than any fleece I’ve ever used, and gives you the option of bringing it up to more fully windproof with other layers, as well as choosing whether evaporation or transpiration will dry things out.  The slim fit, deep partial zip, simple chest pocket, and lack of a waist drawcord tunnel or any other material layered beyond what is absolutely essential maintains and enhances that breathability.  The Light Hoody kept pace with, and probably exceeded, the Sitka Core LW I had next to skin, which is the first time I’ve ever been able to say that about an insulating layer.

I hesitate to be dramatic, but I’ve having a hard time imagining when I would take fleece out into the field again.  The Light Hoody is expensive (I bought it half off), and the durability of the insulation is an open question, but when something this potentially important works this well it is hard to be anything other than excited.

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Add:  I’ve received a number of requests for specific comparisons to other garments I’ve used, so this is that, along with a few more specifics on recontextualizing insulating layers and warm in the outdoors, generally.

Warmth in the outdoors is often understood as an overly simple concept. Static warmth for a dry, stationary body requires only decent fueling and hydration and enough layers. Dynamic warmth, where said body is in various states of motion through varied environments, is governed by the same rules, but they are interrupted by the need to protect from external, while venting and moving internal, moisture. Achieving a balance between external protection and internal insulation is, most of the time, the key to sustainable activities in the outdoors.

This is what I wrote back in 2015, about the original Rab Strata.  The Strata epitomized the original approach to active insulation; 80 grams/meter Alpha, an uncalendered but otherwise traditional nylon shell, and a mostly mesh liner.  The Nano Air Light Hoody seems similar on paper, if more lightly insulated, but in the field it feels drastically different.  The Light Hoody might be a good bit colder under totally static conditions, but it manages moisture so much better and dries so much faster that they have similar effective warmth.  With the Light Hoody shell and insulation combo so much more breathable than the Strata, and down and down blends so much warmer, I can’t see a place for something like the Strata.

Until a few weeks ago I would have used either a 100 weight microfleece shirt, or an older Patagonia R2 vest, as an insulator and buffer between the hardshell and baselayer in protracted rain.  And I never really felt either to have that many downsides, until the Light Hoody dried so much faster.  I had the R2 vest with me during the hunt, but after the first day it stayed in my pack as an emergency layer, and served as a pillow at night.  I’ll continue to explore what niches, if any, fleece will fill.

I’ve also used plenty of heavier fleece hoodies, largely as insulators for packrafting during cold conditions.  Something like the Rab Novak (which I’ve since sold) was great for that (it was the only insulator I brought for the 2016 Bob Open, for instance).  I replaced it with the even heavier Haglofs Pile Hood (380 grams/meter!), which is still in the proving process, and certainly nice for casual use, if massively bulky.  300 weight class fleece is certainly warmer than the Light Hoody, and while strictly speaking they are as breathable, they don’t dry as fast or pass moisture as well, which makes them, perhaps, a bit anachronistic.


40 responses to “Patagonia Nano Air Light Hoody: the fleece killer”

  1. One of the few pieces of hyped kit I have ever acquired that comes close to matching the hype.

  2. awesome, I see patagonia’s micropuff has changed its fill and become more of a puffy jacket

  3. Dave- how does the nano air compare to the kuiu Kenai jacket? My (perhaps incorrect) understanding is that they use the same insulation from Toray? Hopefully we’ll get some more details on your sheep hunt in the future as well!

    1. I’ve heard it is the same insulation. Can’t confirm that. Shell fabrics could be quite different, too.

  4. How does it compare to the Alpha Strata or High Loft Fleece like the Melanzana piece? I ask because I am trying to find a piece of insulation that dries reliably and is still warm at camp. Preferably something I can use also as a sleeping layer or under a shell during the cold wet range below 45 degrees? Trying to stay away from traditional synthetics due to cost and long term life of the fill due to compression.

    1. Carlos, I had a first gen Strata (80 gram/meter Alpha with a mesh liner), and it was a totally different critter than the Light Hoody. A bit warmer, and much much less breathable. I’m still a bit shocked at how big the differences are between the two. The newer Rab stuff might be different, but in light of the Light Hoody’s performance I don’t see the point of something like my old Strata.

      (I should add that after 3 years my Strata was starting to loose significant loft. Better than Primaloft One, but not immune from the problem by any means.)

      It’s harder to articulate the difference between the Light Hoody and something like the Melanzana Hi Loft (which at ~300 weight is pretty warm). The Light Hoody is both warmer is static situations (i.e. at rest with a hard shell on top, or in your sleeping bag) and cooler in dynamic situations (moving, with partial venting) than a fleece piece of a similar weight.

      For me the Light Hoody could be the sole insulating layer for 40-60 and rainy, and my moving layer (complimented by a down jacket) for colder conditions. Fleece is cheaper and probably has better longevity, hard to see any other virtues.

      1. Thanks Dave you kind of hit the nail on the head for my struggle because my strata isn’t providing the warmth I’m needing when transitioning to static because I end up getting fairly saturated even while venting because of the shell not breathing enough for the amount of warmth it has. Unless it is significantly colder out.

        And this could simplify my layering options allowing me to bring a truly warmer static price with over all less weight. I created a thread at BPL trying to address my concerns.

        This is why I was looking into the 300 weight high loft fleece hoody. More static warmth and breath ability but I think it may still be too warm while active. I guess if I don’t have to put the garment in the pack it will help slow the degradation significantly.

        1. Not sure how comparable this is to the melazana, but I have an older MH monkey man fleece. I did a 6 mile hike in dry but cold conditions (19*f) on the coldest day we got in TX last winter with silkweight baselayers, prana stretch zion pants, and the MH monkey man, although insanely breathable, was way too warm. I ended up wearing a kuiu 210 merino hoody and was super comfy when moving.

          When hunting at 8500 ft in CO I wore the same combo, just no long bottom baselayer and was super warm while sitting still in camp before sunrise at 40*. I’ve never really sweat out the MH monkey man, so I cannot comment on moisture movement. It is as warm today as when I bought it 6 or 7 years ago.

  5. Interesting…I had a KUIU Kenai jacket, but even at roughly 32 degrees it was too much for me when hiking. But it looks like the this hoody has a good bit less of the insulation, which is probably key.

    I had really been considering one of their hybrid pieces (with the fleece back) bc of your thoughts on how much faster fleece dried, but it looks like that may not even be the case here.

    1. The 40 gram insulation is perfect. I was surprised.

      1. Just to give me some better perspective, if it’s 40-50’s and NOT raining, would you even wear this piece? In particular if you are moving? I was under the impression down to about 32 and moving just did baselayer and Alpine Start?

        1. If it is 45, sunny and I’m moving steadily it would be too much. Stop and go while hunting on the other hand, it suits well.

        2. Thank you for the additional perspective. And congrats on the first sheep!

  6. Any thoughts on how this compares to a light softshell like the OR Ferrosi in terms of water resistance? I’m looking for a jacket for skinning up while ski touring in the PNW.

    On warm, wet days I use a fleece > light softshell, and on coldish wet days i use a fleece > light insulated piece (OR Cathode) > softshell.

    Interested in swapping to just a jacket like the nano air light for warm, wet days and layering a fleece underneath for colder days, providing it has enough water resistance to deal with a few hours of gloppy, wet PNW snowflakes falling on it. This would definitely simplify things quite a bit.

    Also interested to see if anyone has compared it to Arc’teryx’s Proton LT, which might be a bit better of a winter option.

    1. The DWR is good, so it should be as good as most in mild precip. With the way it moves moisture stuff that accumulates on the surface should evaporate faster than most, which seems to be what wets out most soft shells in warm snow.

  7. Sounds sweet. So how would you compare the warmth to, say, cap 4 + windshirt?

    (…and congrats on the sheep)

    1. Both warmer and less warm, depending on conditions. Certainly warmer under a hardshell, but more air permeable than just about any windshell I can think of.

  8. I ended up returning my nano air light because of the fit. The forearms were way too tight to the point where they limited my mobility. Otherwise a good piece. I’d venture to say the montbell thermawrap would be a much more affordable option although the face fabric is probably less breathable.

  9. You glossed over the sheep, am I remembering correctly that this is your first? Congrats either way, and thank you for the review.

    1. Fourth tag in as many years, and the first dead one. Pretty psyched.

  10. Cool gear post, bro. More sheep talk, though!

      1. Engaging words. And pictures not even necessary.

  11. Patagonia has a new air impermeable synth jacket coming out using some new mysterious insulation that (apparently) has survived their loft degradation torture tests in an unprecedented level and has a higher warmth per weight than anything else. I wonder if they can put that insulation into an air permeable shell?

  12. So now I have post purchase dissonance about my recent 14oz high loft fleece purchase that I got for cold and wet weather : ) Most of the time I use a 100 weight fleece for wet cold weather, but a few times recently it hasn’t been quite enough for me.

    A few questions please:

    This offering from Macpac looks similar, but no breathability data and the insulation looks slightly heavier- what do you think?

    Also have you seen the Nano air light hybrid offering and where, if anywhere, do you think this might fit.

    Sorry for all the gear talk, but this post has obviously struck a chord with many.

  13. todayisthesunsbirthday Avatar

    Great post, Dave. I’m wondering whether this type of piece could be deconstructed with alpha direct and a high CFM windshirt, with more versatility, wicking, and even faster drying. I’m hoping pieces like the Rab Flash but at a weight equivalent to the nano air light are on the horizon. Perhaps at that weight durability would suffer though….

    1. Very possibly. The Rab alpha direct sweater is next on my list for this reason.

      1. The OR Ascendant hoody has impressed me thus far. Worked extremely well in wet+windy conditions and I think the polartec alpha is a nice hybrid of synthetic+fleece, hopefullu longer lasting than traditonal synthetic offerings

  14. Do you think we should be worried about it losing its loft if used under a pack or harness?

    1. I expect it will be an issue, but presume it will do much better than Primaloft.

  15. […] (so long as the headwind is mild).  There are a few things I almost added to this list; the Nano Air Light hoody (haven’t had it long enough), the MSR Windburner (use it on every trip, could be lighter), […]

  16. […] tasks (namely, keep water out while not impeding movement or vision).  I should also mention the Nano Air Light hoody, which I was wearing on every single successful hunt this fall and which as the temperature dropped […]

  17. […] (and cheaper) synthetic coat isn’t a bad option either, assuming I’ll likely have the Nano Air Light along as well.  I also wonder if an equivalent down coat with more tightly stuffed baffles would […]

  18. […] toimii mainiosti kosteissa olosuhteissa, kuten meloessa tai sateessa kuoritakin alla. Esimerkiksi Dave Chenault pitää tätä vaatteen parhaimpana ominaisuutena, minkä takia hän on puhunut Nano-Airista […]

  19. collinswannabesite Avatar

    How is the face fabric holding up on this? Between the sale and a credit I had from a warranty issue, I picked one up. I like the face fabric (very similar to the Kuiu Kenai I had), but seems very soft. (As an aside to anyone else who reads this, glad I sized up to a large…normally patagonia large is way too big on me, but with the slim fit it’s perfect).

  20. […] only two items from all the action layers I’ve had or have, they would be the Windveil and Nano Air Light.  The Alpine Start would be hard to give up, and the Airshed hasn’t been in my closet long […]

  21. This looks like a really interesting piece, to pair with a windshirt

    1. Alpha Direct is interesting stuff. I’ve been using an OR Ascendent lately (direct with a shell) and have been impressed. Similar, yet different than the Nano Air series.

  22. […] things, while somehow not providing as much static warmth as 16 ounces should have provided.  The Nano Air Light is a good bit to the mid layer side of things, which is no vice but does limit it.  There are […]

  23. I had one (Nano Air Light hoody) in size large, was difficult to get on/off and ended up selling it. Found a lightly used one on eBay in XL and grabbed it. I’ve since used it extensively both elk hunting and in the winter snowshoeing/backcountry skiing. The amount of insulation and fabrics used, make it the perfect balance of breathability and warmth for an active layer.

    I love this piece! Of course like so many good things that Patagonia has produced, they discontinued it :(. It’s been discontinued for some time now making it that much tougher to find, BUT I just found one on Patagonia’s wornwear site. Mine is still in great condition and lots of life left, but it’s such a good piece I really wanted another to sit in my closet for a couple of years waiting for the old one to wear out :)

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