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Information about Kenyon Polartec® Power Stretch® Base Layer Bottoms - Heavyweight (For Men)
2ndss. Gearing up for some cold-weather adventure? Start with Kenyon's heavyweight base layer bottoms, made with Polartec® Power Stretch® for top-notch warmth, breathability, wicking performance and range of motion.
  • Polartec® Power Stretch® fabric is wind and abrasion resistant, breathable, and features four-way stretch for freedom of movement
  • Heavyweight base layer
  • Base layer weight: Heavyweight
  • Made in United States of America
  • Visit our Layering Guide
Specs about Kenyon Polartec® Power Stretch® Base Layer Bottoms - Heavyweight (For Men)
  • Base layer weight: Heavyweight
  • Fabric: at least 42% polyester the remainder nylon and spandex
  • Care: Machine wash/dry
  • Weight: 6 oz.
  • Made in United States of America
  • Visit our Layering Guide

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Most Helpful 5-Star Review

Verified Buyer Reviewed by kairmid from Boston, Ma on Sunday, October 30, 2011
Nice snug fit, super soft inside. And not just for men - I'm female, 5'10", generally wear a size 16 and the large fits perfectly. They don't sag, like my last pair (Lowe Alpine). Great on their own with a long tunic top, great as a base layer. And they're made in the USA, I'm trying to buy as mu... Read More
4.376404 5 Based on 178 reviews: Overall:
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  • Verified Buyer Reviewed by Jamma Gramma from Iowa on Thursday, August 6, 2015
    These fit my husband mid-calf, and he's only 6'1". I checked to see if they come in tall & they don't (at least not on STP. Other than the length, they'd be great.
  • Verified Buyer Reviewed by Davey Crockett from Tennessee on Thursday, June 25, 2015
    1. First time I ordered, A+, five stars. Very thick, expedition level warmth, great fit, flexible. Usually wear a 33 waist and the L were just about right, and with a little breathing room. Wide banded cuffs make the ensemble of socks, base layer, boots and and top layer work seamlessly. Very well made quality product. Used them skiing once, plus on a couple of cold night camping trips. Couldn't be happier.

    2. Second time I ordered, 2 stars. Not the same product. Thinner, no banded cuffs. Tight. Not as flexible. Cheap. Junk. Thinking it was a mistake, I returned them for a third order, but received the same inferior product.

    Guessing Sierra ran out of the good ones, and switched them with something else entirely. The second and third pair's label still read, "Kenyon Polartec® Power Stretch®," but it is a very very different product than the first pair.
  • Verified Buyer Reviewed by Too much coffee man from Colorado on Monday, May 25, 2015
    I used to order the Sportif fleece pants, which are baggy, and Black Diamond fleece bottoms, which are very thin and lightweight but age quickly in the wash. These are far better than both, warmer than the Sportif and more comfortable and wear better than the Black Diamond. Supposedly these are seconds, but I cannot tell why.
  • Verified Buyer Reviewed by Tony from Ohio on Saturday, April 25, 2015
    They are great if you get the right one's. If you notice in the specifications, there are 2 different sets of material used to make these. You are at the mercy of the order pickers at sierra. One pair is great. Roomy and warm. The other pair is thin and super tight. My son received the great ones, I received the thin ones. I returned mine 2 different times and still received the thin ones. I called Sierra and was told you get what the pickers grab out of the bin since they both have the same item number (stupid).I don't understand how these could be classified as similar garments when they are 2 completely different items. Sad thing is, I really want the heavier ones , ( my son loves his) but I'm tired of the hassle! All the bad reviews on these is because people received the thin super tights. Come on Sierra, change this
  • Verified Buyer Reviewed by Badbrad70 from Michigan on Thursday, April 9, 2015
    Decent long underwear, very warm. Not that flexible, don't expect to run or do any squatting in these. Construction of the product seems good.

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  • 1-10 of 17 questions
    • Answer What are these made of: "Fabric: 48% polyester, 34% nylon, 18% spandex or, 61% polyester, 25% nylon, 14% spandex"

      As for the rest, I own both merino wool base layers + fleece base layers. I like them both for various reasons.

      - FLEECE: When I'm on backcountry expeditions, the fleece wins. Extremely lightweight, breathable, dries quickly and very warm depending on the quality/ thickness/ composition.

      - MERINO WOOL: Hands down the cosiest, best feeling on my skin, very warm, and wears like iron. Tends to be slightly heavier weight-wise, however. I'll use it for skiing, day hikes, and just keeping warm at home.

      I don't work outdoors for a living, but if I were, I might try two base layers... maybe a technical polyester lightweight fleece on the inside, then merino wool as a mid-layer. In fact I often use this combination anyway. Best of both worlds: max breathability of the polyester base, and excellent arming of the merino mid.
      Answered on 7/23/2015 7:07:52 PM by Davey Crockett from Tennessee
    • Answer I like these. They are light and the inside is a short fleece so has good connection with skin. The outer layer is smooth/slippery so doesn't bind on clothing. These are a little thicker than duofold. They will dry quickly. They are made of 54% polyester, 31% nylon, and 15% spandex. I suggest ordering a size or two larger. There is no opening in the front which may be a consideration for men to think about. Are they better than merion wool for warmth? I think so but others may disagree.
      Answered on 7/24/2015 8:00:28 AM by Kayte from PA
    • Answer 48% Polyester, 34% Nylon, 18% Spandex. Just returned from fishing in Alaska and wore these inside my breathable waders and they performed exactly as I needed. For extreme cold I recommend these as a base followed with a middle layer and a wind/weather proof top layer. Merino wool is a great product but for the price and performance it would be hard to beat this product.
      Answered on 7/30/2015 11:49:08 AM by Let's Get Mikey from Utah
  • Question “What is the inseam for a size small? What is the inseam for a size medium?”
    Asked on 1/26/2015 12:11:59 PM by Andrew from Virginia
    • Answer Not sure on the measurements but my bf says the insteam seemed short he felt pretty bunched up down there. Hope this helps.
      Answered on 1/26/2015 12:25:50 PM by Jackie from New Jersey
    • Answer 33 for size M
      Answered on 1/26/2015 12:45:59 PM by Andrey from OR
  • Question “My husband works outside in the very cold will these keep him warm? ”
    Asked on 9/23/2014 6:56:56 AM by Linda from Pa
    • Answer I use for both work and skiing. They work very well.
      Answered on 9/23/2014 7:01:28 AM by Nemesis67 from Detroit
  • Question “My husband works outside in the very cold will these keep him warm? ”
    Asked on 9/23/2014 6:56:01 AM by Linda from Pa
    • Answer Yes, these base layers are different than any I've ever seen! When I got them out of the box, I thought these are not what I was looking for & my husband said the same thing. They looked like sweat pants, very thick & looked baggy not tight fitting. I said, "well try them on any way!" He couldn't believe how wonderful they were. They are tight fitting, so warm & so comfortable! He looks forward to wearing them when the cold gets here! I highly recommend these to keep you warm & very comfortable.
      Answered on 9/23/2014 7:12:05 AM by Amie from KY
  • Question “Does the fabric pill on these? Thanks!!”
    Asked on 12/29/2013 9:55:07 AM by KFingC from RVParkUSA
    • Answer Has not to date on the 3 pairs that we use! Brendan reports that these are the best long underwear ever.
      Answered on 12/29/2013 11:08:24 AM by Molly from Avon, CO
    • Answer I have not taken them out of the package, because they appear to be so thick that I'm sure they will be too warm. I had a different impression of how thick they were from the photos. But the price was so appealing that I can't even justify sending them back. Maybe I will pass them on to a family member who skis. Generally speaking, based upon past experience with clothes, cotton/poly blends are the worst at "pilling" as you call it. 100% polyester does not pill at all. These are nylon/poly, which I predict will not pill at all. They do not have a fly, so they are unisex garments. Other similar base-layers have flys.
      Answered on 12/29/2013 12:51:27 PM by landscape painter from california
    • Answer Not so far and if they did I don't know anyone who would not wear pants over them.
      Answered on 12/29/2013 2:09:52 PM by Frap from Chicago
    • Answer I wear these all the time and have seen no pilling.
      Answered on 1/1/2014 3:14:49 PM by Active older woman from Upper Michigan.
  • Question “Would these work for a guy with a 34 inseam?”
    Asked on 12/12/2013 8:07:43 PM by Rick from NY
    • Answer being a woman, I really cannot say, but these are very thick - which might be good if you are in snow country.
      Answered on 12/12/2013 8:59:34 PM by landscape painter from California
    • Answer I just tried these on and I wear a 32 inseam. There was some bunching of material around the ankles, so they will work for someone with a 34 inseam. I'm very impressed with them as they keep my legs very warm.
      Answered on 12/13/2013 9:09:58 AM by Dalegend27 from Pittsburgh, PA
  • Question “Would these be good for doing Yoga at home?”
    Asked on 11/15/2013 11:12:44 PM by Tony from Vancouver
    • Answer You could wear these for doing Yoga at home if you wish to. They should be comfortable enough.
      Answered on 11/18/2013 3:18:59 PM by Product Specialist Greg from Sierra Trading Post
  • Question “Do they have a drawstring waist?”
    Asked on 10/1/2013 6:10:05 AM by Jim from Cape Cod
    • Answer They do not have a drawstring waist, it is an elastic waist.
      Answered on 10/1/2013 10:48:59 AM by Prod. Spec. Kevin from Sierra Trading Post
  • Question “How are these sized? Can you suggest a fleece lined/Lycra men's bottom in a small or med?”
    Asked on 11/13/2012 12:00:00 AM by Peggy from Unknown
    • Answer Due to the nature of the closeout business, we often receive items in limited quantities. Therefore, popular sizes and colors can sell out quickly. Occasionally we are able to reorder a product, but closeout items are typically unable to be reordered.|Unfortunately we are currently out of this item, but we suggest signing up for the My Updates as the best way to monitor incoming products. You will receive email notifications of our newest stock items. You can also access the "New Items" section of our website at anytime. New Items are all products that have arrived within the last 21 days. |http://ww2.sierratradingpost.com/newproducts~21/|http://ww2.sierratradingpost.com/myupdates/myupdatessignup/
      Answered on 11/19/2012 12:00:00 AM by Prod Spec Kevin from Sierra Trading Post