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Reactor Fleece Jacket - Men's

4.274193548387097 out of 5 stars
62 Reviews
Current price: $59.37 - $62.40 Original price: $104.00
40% off
Color:Classic Blue


Size Chart


Reactor Fleece Jacket

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. An elastic drawcord and wind flap behind the front zipper adds protection from fall gusts when you're raking leaves.


  • Stay warm on the chairlift or when raking leaves in a fleece jacket
  • Seamlock construction is comfortable and easy to wear all day
  • Elastic hem traps heat and blocks out cold during crisp fall days
  • Reinforced shoulders stand up to extra wear from packs or bags
  • Regular fit easily layers over or under an extra layer for warmth
  • Item #MAR01K7
100% polyester
2 zippered hand, 1 zippered chest
Claimed Weight
Recommended Use
all-mountain skiing, all-mountain snowboarding, backpacking, hiking
Manufacturer Warranty

Overall Rating

4.5 based on 62 ratings

Review Summary

1 Stars - 3 reviews
2 Stars - 5 reviews
3 Stars - 3 reviews
4 Stars - 12 reviews
5 Stars - 39 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

November 6, 2023

Lightweight, great for running

I've used it several times
Size Bought:

Very lightweight fleece. Use it for running/hiking. fit is great and pockets work well. Need a shell for windy days, but super for 45-60 degree weather.

4 out of 5 stars

November 7, 2022

Wonderful but Seams Coming Apart

This is not meant to be a stylish product but an extremely useful one for actual backpacking. I never take another insulation layer in my ultra-light pack on top of my wool and down but I am taking this one from now on. This is so warm and so light I prefer to wear it while sleeping instead of my down. I just keep the down for emergency temperature dips and use it as a pillow now. The only problem and it is a big one is the the fabric is so fragile that the seams are ripping out. The fabric though is what makes it so great at insulating and so light. I am hoping Marmot will replace it.


Originally reviewed on marmot.com

5 out of 5 stars

July 23, 2022

Love this Jacket!

[This review was collected as part of a promotion.] I have two of these and just love them. They are lightweight and yet cozy to wear. Durable and washable


Originally reviewed on marmot.com

5 out of 5 stars

April 19, 2022

Very practical for travel

[This review was collected as part of a promotion.] Very comfortable, light-weight with the desired level of warmth, packable for travel. I like the 3 zippered pockets.


Originally reviewed on marmot.com

2 out of 5 stars

March 11, 2022

Not a favorite

Cut is way too tight for me, particularly the sleeves. They are tiny!


Originally reviewed on marmot.com

5 out of 5 stars

February 10, 2022

Best fitting zip up I own - maintains shape

Great fit and look. Incredibly comfortable. And my wife loves the color!

Doug La

Originally reviewed on marmot.com

3 out of 5 stars

January 5, 2022

Good jacket, didn’t fit me

I was looking for a mid-to-light weight breathable fleece mid layer to wear under a shell for skiing. The Reactor seems to be a good product. Just the right weight, perfect pocket configuration (2 hand plus a chest). Fatal flaw for me was the sleeve length. Sleeves were too short, and rode up when reaching. FYI, I am 6 ft, 4 in tall, 175 lbs with long arms. The large was a good fit, except for the sleeve length issue.


Originally reviewed on marmot.com

5 out of 5 stars

December 23, 2021

Great Travel Jacket

Provides a decent amount of warmth while stationary and doesn't overheat while traveling with or without a backpack. Not bulky, so packs well. Size Large fits me well, although the arms are a little narrow for my normal to slim arms - more noticeable with a long-sleeved shirt underneath. An XL would be too big. Great for layering: base layer + Marmot Reactor + synthetic down vest + water/wind resistant shell. I've been searching a while for the features available in this jacket, I especially like the chest pocket being large enough for my cell phone in its case. Nice to have zippered hand warmer pockets.


Originally reviewed on marmot.com

2 out of 5 stars

June 24, 2021


I like many Marmot products. I have a Marmot rain jacket and down vet that I love. However, I was disappointed with how the Reactor Jacket hung on me. There was no structure to it, just hung like a thin blanket. I returned it.


Originally reviewed on marmot.com

4 out of 5 stars

June 9, 2021

Comfortable jacket

[This review was collected as part of a promotion.] Warm and comfortable to wear. The quality remains good after 1 year of usage.


Originally reviewed on marmot.com