Marmot Astrum Jacket - Men's

Lightweight warmth abound.

From exploring alpine lakes in autumn months, to navigating bustling city streets come December, the Marmot Men's Astrum jacket brings you warm protection in a lightweight package. Crafted with a tough and stretchy nylon fabric, this jacket resists the abrasive surfaces of granite rock and building walls alike, yet still allows maximum flexibility when you're out galloping around on your next adventure. And, when temps start to head south, the Thermal R Active, synthetic insulation does its part to keep you warm, while an AirExchange lining works hand-in-hand with the lining to cool you down should the temperatures turn heel and warm up again. Additionally, an adjustable hem, hood, and cuffs let you customize your protection to match the changing weather, and two zippered pack pockets store your daily essentials in a secure fashion.

  • Lightweight, warm, and stretchy jacket for cool weather romps
  • Flexible, yet tough fabric offers versatile protection
  • Lightweight, synthetic insulation stays warm when wet
  • Adjustable hood, hem, and cuffs offers you a customized fit
  • Zippered pockets safely stashes valuables
  • Reviews
  • Q & A

Typical Marmot Brilliance

    This is exactly what I was looking for and why Marmot continues to be one of my favorite brands. I'm not sure why I even try other companies anymore. As usual, the genius behind Marmot's products easily go unnoticed by those who mistake them as just another Patagonia copycat brand - which they are not. For an athletic, regular, non-skinny male, Marmot is just a better fit. I'm an athletic 5'10" 180 pound male and find all Marmot products fit like they were made for me.

    This jacket is made to layer underneath, which is why everyone is in agreement about this jacket seeming one-size too big. It's like this because it's made to be this way - it's not a mistake. I wear my thin Marmot puffer jacket in the fall (55-35F) and then when winter (< 35F) hits I throw the Astrum over my puffer and I'm good-to-go down to 0 degrees F. When I get hot because I'm being active/hiking/riding, I just take the Astrum off and put it back on when cool down or walking around town.

    Bottomeline: This jacket is made to wear in cold temperatures (35-0F) with an optional under layer if you choose (think: fleece or thin puffer), while still allowing you room to be active. Marmot once again proves with the Astrum that it is a brand committed to making exceptional and minimalist clothing for active outdoorsmen (and women). If that's you then this jacket is what you're looking for. For complete all-weather protection buy a raincoat shell and you're ready for everything.

    You're awesome, Brandon. Thank for helping out our community by leaving this detailed review!

    Just a note on size

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: Medium

    I bought this during the recent summer sale so I can't comment on the actual warming qualities of the jacket, but I wanted to comment on the sizing that many other reviewers have mentioned. I wear a medium in just about everything, but I bought a small based on some of the reviews. The torso was too short, as were the arms and shoulders. I returned it and tried the medium which feels better.

    It wears a little roomy as others have mentioned but very light, I look forward to wearing it through future Minnesota winters.

    Unanswered Question

    hi. can make real measurements this jackets for the size S. interested in shoulders, chest, the length of the sleeves and the total length. and is it possible to use machine washable ?

    Heat Regulator

    • Familiarity: I've put it through the wringer
    • Fit: Runs large
    • Size Bought: Small

    I love this jacket, it quickly became my go to. I wear it all the time and everywhere in temps from 50 down to 15 degrees or lower (with a small fleece underneath in that cold). Somehow it manages to keep me warm, but not too warm. And yet, it still seems to provide plenty of warmth even when it is windy even though its breathable. It has held up very well so far, after 4 months even the DWR finish is still going strong deflecting light rain and snow effortlessly. I highly recommend this jacket.

    One last note, I normally wear a medium and definitely had to get the small in this jacket. The medium fit me like a large normally does.

    Warm and Breathable

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: medium

    I got this jacket for mostly casual use to layer with another jacket around town. However, after using it I have found that this thing is insanely warm when you need it but breathes really well when you are being active. I have used it skiing on really cold days (12 degrees or so) and was very pleased with the piece.

    I probably wear it 90% of days and am super stoked.

    I feel that it runs true to size but it is a baggy fit for sure. Lots of room to layer under it.

    Warm and Synthetic

    • Familiarity: I've put it through the wringer
    • Fit: Runs large
    • Size Bought: medium

    I really like this jacket. It's comfortable, warm and breathes well. I think it runs a little big. I have the Medium and it is the biggest Medium I have. I was actually able to get a small on and zip it all the way up. I have a 38-39 inch chest. The jacket is really warm though. I dig it.

    Nice except for the the price

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: small

    I'm 5'6" and athletic, and the medium in this fit great. Marmot is one of the only brands that seems to fit me well, not too slim, and not too baggy. I would say the main reason I didn't keep this jacket is that because for the price, I would have expected something either warmer or lighter. This feels like a fall jacket to me, and I couldn't justify the price for that usage.

    Size bought was a small or medium? I'm confused.

    Its a great piece... but not an amazing

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: Large

    If I could give 3.5 stars I would. There is NOTHING wrong with this piece. It IS very nice.

    I was looking for an synthetic midweight jacket/hoody... and this is just that. Everyone makes one of these with small differences. Patagonia's Nano-Air, Arc's Atom and LT Atom Hoody... etc. etc.

    What I liked - I liked the roomier fit and the wider back. It has a non-technical feel to it. There is a small amount of stretch in all the material. Love the hand warmer pack pockets.

    What did not work for me - I found the Large a little too roomy, sleeves a touch long... but the medium too small. I found that I really wanted a vertical exterior chest pocket.
    The internal zippered pocket is on the left inside ... which bugs me... feels like is should be on the right.

    Very Nice piece but did not blow me away. I't trying others... trying not to buy a Arcyterx Atom Hoody... Why - because I know I love it but I have the jacket... and the Lt. Weight Jkt... and want some diversity... but maybe I don't?

    Light, warm, clean, very efficent.

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: Medium

    I picked up this piece back in November for a solid and light winter mid-layer. The insulation, fit, weight, and color all really worked for me and what I needed.



    Use:

    As of now I have put it through 5 months of alpine touring, resort skiing, winter camping, climbing, and daily use here in chilly Salt Lake City. Though I'd recommend layering this under a shell in any rainy/snowy conditions, I've done some seriously sweaty cardio, and been caught in some accidental blizzards with this jacket. The Thermal R Active insulation is very efficient in those less than ideal conditions, and I haven't had a single issue with warmth. Because of this insulation, the jacket doesn't need all the compartments to keep the insulation separated, therefore no "cold spots" between compartments. The inner material is very soft, and does not feel sticky when sweaty.



    Fit:

    The body of the jacket fits relatively "Athletic", though there is no restriction in range of motion, and room to layer. The hood fits very snug when cinched, and keeps you very warm. The arms fit a littler long and straight, meaning they scrunch up a bit on my skinny arms. This jacket would do really well for most body types, and especially people with longer arms. In general this jacket fits true to size, but if I had to pick small or large, I'd say it runs just a tad large.



    Overall:

    I would most definitely recommend this to any and all outdoorsmen. This jacket has handled everything I've thrown at it, and I can tell will be a key piece in my collection for a long time.



    Cheers,



    Doug

    Light, warm, clean, very efficent.

    awesome insulator

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: Medium

    Love this jacket. With all the options out there, I opted for this one because of the stretch and the feel of the fabric Super warm for how lightweight it is as well. The shell is reasonably durable for how soft it is. I have been wearing with a t-shirt in about 40 degrees and very warm and then dropping into the low 30's and still comfortable. Lower temps than that, I have put just a long sleeve on and have been fine. It fits well. I am a medium in most everything and this fits great in that size.

    Great Jacket

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: L

    I bought this jacket as an impulse buy, hearing about the stretch it has and the awesome synthetic insulation.
    I'm glad to say I haven't regretted my buy.
    It's super warm, and blocks a fair amount of wind as well. I wear this jacket riding my motorcycle at temperatures around 40 degrees going 70-80 mph and I have been decently warm. The hood adjustments work really well on my helmet, and I imagine would work just as well on a ski or climbing helmet.
    This is an awesome buy, Highly recommend this jacket.
    The only con I've found with this jacket is that it is kinda baggy. It'd be perfect for layers underneath, but the overall feel the jacket has a loose and relaxed fit to it.

    Great Jacket

    • Familiarity: I've used it once or twice and have initial impressions
    • Size Bought: XL

    I just got this jacket and I like it. Warm and cozy are the first two words to come to mind. I wear a XL and this one fits great. It is a regular fit so you can have some layers under and looks slick enough to not only wear at the campsite but also out on the town. Overall a great piece I highly recommend.

    Sick jacket

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: Medium

    This thing's legit. I had been looking for an insulated jacket for a camping trip spanning Redwood National Park, Crater Lake, and Lassen Volcanic National Park this past week that was filled with various hikes and a few chilly night time camp fires/beer sessions. Honestly I can't say anything bad about it.

    It got put to the test during a hike up Lassen Peak. It was snowing and around 36°F at the base/beginning of the hike, and ended up being around 28°F with strong winds at 10,400'. The Astrum jacket and a single t-shirt underneath kept me comfortably warm the entire time and wasn't restricting at all. The only thing I wish I would've had were some gloves!

    Side note, I live in Santa Cruz, CA, so those temps were really cold for me. I began the hike wearing a Marmot Minimalist jacket (size M) over top of the Astrum jacket, which actually turned out to be a pretty sweet (and waterproof) setup. I got warm wearing this combo during activity, but I was pretty happy I could layer both jackets.

    While hanging around camp I wore it with a flannel shirt underneath and stayed comfortably warm.

    I also find Marmot to be a bit longer than some of Patagonia's insulated offerings, which is appealing to me as well.

    Sick jacket