Back to top

Please select a color/size.


  • Features quick-drying, moisture-wicking, ultra-soft Polartec® Classic 100 microfleece for warmth
  • Natural stretch increases comfort, and non-piling surface maintains its nice appearance
  • Windflap backs the front zipper; chin guard is soft against skin
  • Marmot Reactor features zippered handwarmer pockets, sleeve pocket with a low-profile bonded zipper and hem drawcord
  • Angel-Wing Movement™ allows full range of arm motion and prevents jacket from riding up when arms are raised
  • Flatlock seams ensure chafe-free comfort


View all Marmot Men's Fleece Jackets

REI membership


Best Use Multisport
Fabric Polartec Classic 100 polyester fleece
Fleece Weight Light
Hood No
Back Length Hip-length
Gender Men's
Weight 14

Size chart

Sizing notes

TALL: Some pants, shirts, jackets and parkas are available in tall sizes, which generally means an inseam that is 3 inches longer and a rise that is 1 inch longer, a shirt or jacket body that is 2 inches longer, a parka body that is 2.5 inches longer and sleeves that are 2.5 inches longer than regular sizes.

Rated 5 out of 5 by from This jacket has the softest This jacket has the softest feeling fleece I've ever felt. Its true to size and is suprisingly warm as a stand alone jacket in moderately cool temps. I love it and have recieved a couple compliments already after owning for a week. Marmot has made me another satisfied customer yet again.
Date published: 2013-08-15
Rated 4 out of 5 by from So close to perfect! I'm 5'6" and 180 pounds so finding a jacket or any clothing is tough. Medium Marmot jackets tend to fit me well, this one is as close to a perfect fit as I could buy off the rack. Lightweight, keeps me warm enough for walking from the parking lot to my office/mall etc. The only drawback is the pocket on the arm sleeve. It's useless. You can only hold a photo ID and some cash. Can't hold a phone, can barely hold my four keys. Keep in mind, it's Polartec 100 weight and is the same material that other manufacturers use.
Date published: 2013-06-10
Rated 5 out of 5 by from Excellent fit, finish and comfort I was looking for a full zip jacket to work either as a standalone, or under another outer layer. Didn't want a bulky fleece and found this to be thin enough to work very well. Bought it in SLC while on a ski trip and it's really proven it's self. The build quality is excellent and it fits well under several other outer jackets - both a Gore-Tex shell and my motorcycle jackets. Just haven't found a use for the shoulder pocket, but I do like the zipper hand warmers. Highly recommended.
Date published: 2014-04-20
Rated 5 out of 5 by from Love Love Love! I purchased this as a replacement for the REI micro 1/4 zip when I was on the way to the UK for a 9 day trip. I word the replacement literally out of the store, and onto the airplane. Combine this with a MH shell (cohesion stretch) and you've got quite a system. This jacket just oozes quality. Everything from the tags, zippers, sewing, and the weight - it is just 110% perfect. The details like Marmot logos on the zipper pulls and embroidery bring it up a notch past 5 stars. As far as the weight of the fleece I would mark this slightly warmer than a thin 100 weight as there is a mesh liner inside the jacket, and the thickness of the fleece itself is, well, thicker. I have owned a LOT of fleece over the past 20 years, and I must say - this one is my favorite. Don't hesitate - buy this jacket!
Date published: 2011-04-26
Rated 5 out of 5 by from Doesn't get any better Excellent quality and much warmer than I imagined for a Polartec 100 jacket. This is exactly what I've been looking for to add to my hiking kit. It even packs small enough to fit in its own pocket. It's cut more slender than a brand X fleece to save weight, but still fits my "bay window" just fine. Best part? It actually weighs exactly the same as advertised! Even in XL, it's exactly 14 oz.
Date published: 2011-03-23
Rated 4 out of 5 by from Good fitting and looking jacket Pros: Looks good. Super comfy. Lightweight. Is generally pretty warm. Cons: The arm pocket isn't really useful for anything, just there for looks I guess. I would have liked a pocket on the inside. Does not block the wind, but was not expecting it to. All in all, was a good purchase. 5 stars if they had an interior pocket. Grab it if you can find it for a deal!
Date published: 2014-05-02
Rated 5 out of 5 by from Super happy with this purchase I purchased the reactor fleece to serve as a mid-layer for my palisades shell. It's remarkably lightweight, yet keeps me nice and toasty as a standalone jacket in moderate to cold weather. It's also quite soft and has a great stylistic cut to it. Like most Marmot products, it runs a little bigger than normal, so I would advice sizing down one size to get the right fit. Overall, couldn't be happier. It's lightweight, warm, soft, and looks good to boot!
Date published: 2011-09-12
Rated 5 out of 5 by from super layer. Not too warm and breathable Very difficult to find a layer that is a little warm, but not so warm that you sweat when you exercise. This item is perfect for me. I can wear it when it's in the 2o ties with only an outer shell. And if I go inside, it's breathable enough that I don't feel warm. It's also light weight. Some folks may need something warmer, but it's great for me. Can't wait to try it in warmer weather: 30'ties, 40'ties.
Date published: 2014-02-13
  • y_2017, m_6, d_25, h_4
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_23
  • loc_en_US, sid_802258, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_rei-inc
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getReviews, 56ms
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getContent, 131ms
  • bvseo-msg: The resource to the URL or file is currently unavailable.;