Customer Reviews Of:
Marmot Isotherm Polartec® Jacket - Insulated (For Men)

Closeouts. With low-bulk Polartec® Alpha insulation, a durable shell and highly breathable lining, Marmot's Isotherm jacket is ideal for rigorous activities in cold weather.

Average Rating based on 8 reviews 4.000000 0 5
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  • Verified Buyer Reviewed by Locomotove from Connecticut on Tuesday, December 26, 2017
    Okay, I like this jacket. It's my second one from STP. Polartec Alpha insulation seems to work well and I also like the breathability of the jacket's side panels. I use this jacket while hiking and around town and if needed, between a base layer and a Gore-Tex jacket. The Gore-Tex jacket has pit zips and that combination with the Isotherm helps keep me warm and dry.
  • Verified Buyer Reviewed by Bruce Tan from China on Thursday, March 16, 2017
    good quality,warm and lightweight,size s fits me well except long sleeve.
    otherwise, the service of sierra trading post is impressed!!
  • Verified Buyer Reviewed by Locomotive from New England on Saturday, January 7, 2017
    This is my first piece of gear made with Polartec Alpha. I'm a big fan of down and own two Ghost Whisperer jackets that I use for layering and with Gore-Tex shells as needed. I bought the IsoTherm jacket to try out the Polartec Alpha material and because I like the features including the angle wing design and several videos I reviewed before the purchase indicated it's warmth and construction qualities were excellent. I'm not disappointed with this purchase. My primary use of the jacket is for casual wear but I will also use it for late fall and early spring backpacking along with a lightweight wool base layer. I live in New England and so far, the jacket has performed well in temps in the low 20's (F). Without additional layering, I think that's about the limit of the jacket's warmth. I've noticed with the down jackets, even a little dampness (e.g., snow) causes the material to feel damp. In the same conditions, the Isotherm has not had any issues and has become my go-to and around town jacket. It will be interesting to see if the number of Polartec products increases. Thanks for reading.
  • Reviewed by A disappointed buyer from San Francisco, CA on Monday, January 11, 2016
    I bought this to play tennis in. It's chill during the winter in SF. After playing for forty minutes in this jacket, I noticed that my hands were wet. Sweat was collecting on my forearms and dripping onto my hands. Because I paid 7 or 8 bucks shipping and it would cost as much to return, on top of which having worn it once doesn't guarantee Sierra Trading Post returning it, I have reluctantly keep the jacket. I also have an Alpha insulation jacket by Patagonia that doesn't seem to suffer this problem of acting like a plastic bag. I haven't played tennis in it. I have lightweight jackets from Marmot that I love which is why I bought this. Save yourself the trouble. Don't buy this and if you do, buy it from someplace with a decent return policy, like REI.
  • Reviewed by Neeman from Israel on Thursday, November 26, 2015
    It is a cross between a fleece and a jacket
    Has bulk with no weight
    The outer layer is wind resistant, not more than that
    The jacket is cut smaller
    I normally take a medium for a mid layer and a larger for a outer layer
    I ordered medium and it is tight round the back
    Order one size up
  • Verified Buyer Reviewed by san from Oregon on Monday, August 24, 2015
    Jacket is very comfortable. The jacket has 1 major issue. The jacket body area material is very soft and zipper catches easily and fabric destroyed on day one. The softshell on sleeve is nice and I wished the whole jacket in that softshell material. Hand cuff on this isotherm is not great. I must prefer to Arc'teryx Atom LT hand cuff style. Bought L size and actual ptp measurement is 23 inch.
  • Verified Buyer Reviewed by Jason from wisconsin on Saturday, April 4, 2015
    This jacket performed well above expectations. I tend to sweat a lot when backpacking and then get cold. This jacket definitely helped keep me dry, even when it got colder than expected and we were backpacking in 30 degree weather. All I needed was a light base layer and this. The Polartec Alpha insulation in this definitely exceeded my expectations. It's the mid-layer I've ever owned that actually was wond resistant and breathable enough to stay dry. Finally, you can't beat the weight, if you looking to reduce your backpacking weight, replacing a heavy/bulky mid-layer jacket with this is definitely worth it.
  • Verified Buyer Reviewed by James Chen from China on Sunday, March 22, 2015
    very good jacket, light and warm, I'm 170cm and 60Kg, size s fits me perfect. However, the US domestic freight is expensive.
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