MarmotReactor Fleece Jacket - Men's

React to the cold with warmth.

Be proactive about cold with the Marmot Reactor Jacket. This full-zip fleece features flat seamlock construction for comfort so you can wear it day in and day out. Zippered hand-warmer pockets and a bonded zippered sleeve pocket provide ample storage for your cell phone, wallet, or hands. A hemline drawcord and wind flap behind the front zipper adds protection from fall gusts when you’re raking leaves.

  • Soft and smooth fleece keeps warm on ski or camping trips
  • Polartec Classic 100 fleece sits on the lighter side of fleeces
  • Hem drawcord maintains a secure fit under backpack straps
  • Reviews
  • Q & A

Decent fleece layer

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

The jacket feels really nice and lightweight. If you looking for a nice 100g fleece layer then this is the best bang for your buck. This jacket has a regular cut so it doesn't fit to my body as well as my other athletic pieces. However, it leaves room for layers underneath. Still, it is quite loose in the stomach area that I only reach for it when I want something loose for hanging out or lounging around.

Great Light Weight Fleece

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

This light weight fleece is unassuming, but stands up to the cold when you need it the most. It's cut slim so it fits under a light jacket for that extra layer on a cold day. It doesn't do much in the wind, but if you wear it under a wind breaker you're in business. I like the full length zipper so I can easily adjust and regulate if I get too warm.
I recommend this jacket. It has kept me warm on some very cold early spring days in New York.

Swanky Marmot

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

This fleece is terrific! It's thin yet cozy which makes it awesome for layering. I generally wear a large but went with the medium and it fits me well. This is a perfect fleece jacket for someone like me who enjoys the fitted look.

Does as claimed. Cilantro is green lol

  • Familiarity: I've used it several times
  • Fit: Runs large
  • Size Bought: Medium

Very good quality. It's slightly larger than my other medium sized clothing. The only problem I have is cold wind blowing. If I wear I anything else with it, I heat up quite quickly, even below 30 degree weather. It's breathable, just as they claim. It dries very fast as well. Poured a little bit of water on it, and it disappeared; it was completely dry in seconds. Wore it running and you couldn't even tell I was sweating. The only problem I have is that the Cilantro looks yellow on all of my devices. If I had known it was a light green, I would have gotten a different color. I expected green, but was hoping for the off yellow, as it is very hard to find yellow clothing.

Awesome fleece!

    This marmot fleece is supersoft and really sharp looking. I originally bought it for strictly an underlayer, But was surprised with how stylish it is. I will definitely be wearing this throughout fall, and on hikes with one layer under, also the Alpine green looks better in person than it does on line. New favorite fleece.

    Warm on a still day

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

    This fleece has served me well. It is a little baggier through the body than I like but maybe I wear my clothes too tight. The fleece is warm when layered under a windbreaker, but on its own the lightest breath of wind cuts right through it.

    Very satisfied so far

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

    I've only had this jacket a short time, but I'm really pleased with how it performed. I wore it on a chilly morning hike in the White Mountains in early March, and it plus a base layer were perfect for keeping me warm but not sweaty while hiking.

    More importantly though, it held up beautifully when our hike went a little off the rails. When the trail got icy we kept climbing higher than we probably should have even though we didn't have any spikes or crampons. That meant a bit of bushwhacking through branches, and several unintentional falls as well as a couple intentional slides. The jacket slid over rock and rough ice and pushed through thick branches and underbrush without any apparent signs of wear at all.

    It's also nice and lightweight, so there's no real downside to taking it along. I think this will be with me even through the summer months when it's warm enough that I won't usually need it. We'll see how it holds up over prolonged use, but I put it through a lot more than I should have this past weekend and it held up wonderfully.

    The truth!!

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

    First, the material is incredibly soft and super warm. The quality is second to none, the finishing touches on the stitching and Zipper quality are great. I used it as a second layer when we had the coldest temperatures in NJ in 20 years at 28 below 0. It is a bit long at the waist line, however I'm 5'7" 215lbs and I did get the XL. Overall OUTSTANDING, and I would buy it again. I'm sold on Marmot products.

    Blue is darker in person

    • Familiarity: I returned this product before using it
    • Fit: True to size
    • Size Bought: Small

    Before I share anything about the product, I love blue. All shades of blue. I think this jacket works marvelous for mid 50 temperatures in Utah. Not too cold, nor too hot! Unfortunately upon receiving it, I didn't like the color of the jacket (first time I didn't like a shade of blue). Otherwise everything is great.

    Marmot to the rescue!

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

    I had a problem with this jacket and Marmot replaced it and restored my faith in their product. Thanks Marmot!

    light weight warmth

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

    Great light fleece jacket for cool temps..The fleece is very soft and comfy. I use it as a outer layer and when temps demands you can layer it over base layer and layer over it with precip jacket for temps down to around twenty degrees for a light weight none bulky layering system...

    Marmot love

    • Familiarity: I've used it several times
    • Fit: Runs large

    This "jacket" does the job. I appreciate its lightweight and powerful warmth. I use it for everything I do outdoors and it never disappoints. I'm 6' 1" 180lbs with an athletic build and I had to send back my first buy of a Medium in exchange for a Large and it fits ok. I feel it runs a little long but the added length can be utilized. The Medium fit great except it was tight around my chest. Other then the added length of the Large it fits great otherwise. Love me some Marmot!

    Size review helped a lot, thanks.

    I love this jacket!

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

    Fleece is super comfortable and light. Warmth is great as well. I'm 5' 9" and Medium fits great.

    Typical Marmot Quality

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

    I have a lot of Marmot stuff. Bought the Reactor fleece as an addition to my layering system. It is classic fleece, meaning it is warm but not windproof. I didn't expect it to be. I am 5'9", 34 waist and wear a medium. This fits me true to size.



    The jacket is sharp and great as a mid-layer or stand alone for warm ski days or around town. Highly recommended.

    Can this fleece zip into a Marmot shell?

    Can this fleece zip into a Marmot shell?

    Best Answer

    This question was answered below, and as stated there: "No, only the Marmot Warmlight fleece and the Cauldron Jacket and Vest are zip in compatible."



    You could easily wear this fleece under any shell though and it will work perfectly fine. There isn't really a need to zip the two layers together.

    Nice fleece.

    • Familiarity: I've used it several times

    Just what you want out ofa fleece jacket....warm, comfortable and just right as a baselyer under a shell. True to size, like all the oher Marmot stuff I own. You can't go wrong with this piece.

    Great Product

    • Familiarity: I've put it through the wringer

    Light weight,. No compromises in quality. Warm. Looks good. Durable. Would recommend this product to a friend.

    Great Product

    • Familiarity: I've put it through the wringer

    Wearing it right now. Very durable, comfortable, and warm. Would recommend this product to a friend.

    Hard to fit "athletic" body

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

    This jacket is soft, comfortable and the Polartec membrane makes it possible to wear it as an outer layer on relatively calm days. However, being a tall and somewhat slim guy (6" 2', 177lb), Marmots just does'nt fit well. The medium had too short arms but nice width, and the large had ok arms but too much width. Kinda felt like wearing a tent... I sent both of them back in exchange for a Norr�na Falketind, L( which btw is awesome!).

    I can add that the reason I wanted a slim-fit fleece was because I plan on using it as a mid-layer under a Patagonia Triolet shell, and therefore wanted as much mobility, e.g. as little extra garment as possible.

    Marmot makes great quality

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

    I have owned three Marmot fleece jackets, and I just purched two more (slate gray and fatigue). While the Marmot quality is superb, I find that the medium size runs a bit small. In addition, the sleeves, especially from the elbow to the wrist, are very tight. Difficult even when wearing a lightweight long sleeve shirt under. There's no way I could wear a sweater under this fleece. Backcountry.com is great!