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Warm to the Core™

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BasePro Pant

(4 customer reviews)



Insulated base layer 

  • Light-weight, nonrestrictive, breathable
  • Temps of -5°F to 70°F with a pant shell
  • Designed to be used ‘next-to-skin’ as a first layer, with the addition of another layer as needed for the conditions
  • Patented AERIS 250 (¼”/6mm of loft)
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  • Light-weight, breathable
  • Wear with your favorite snow pants or work or casual pants
  • Comfortable between temps of -5°F to 70°F with an uninsulated cover or wear insulated pants to be extra warm.
  • Designed to be used ‘next-to-skin’ as a first layer, with the addition of another layer as needed for any condition.
  • Maintains warmth whether soaking wet or dry

-94% Polyester / 6% Spandex 4 way Stretch 1 Sided Brushed Polyester


– Use, in Core areas, of Patented AERIS™ 250 Insulation Technology (¼” / 6mm of loft) Maintains Warmth, Even When Wet.
– Reinforced Stitching
– Covered Elastic Waist Band with Drawcord Adjustment
– Unrestrictive Full Range of Motion
– Lightweight, almost feels like nothing on at all
– First Layer for All Activities
– Reflective Fortress Logo at Front Left Thigh

Weight 20 oz
Dimensions 12 × 12 × 3 in

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4 reviews for BasePro Pant

  1. Gilbert

    I have to say that these are an excellent product, yesterday I tried the basepro pants when I went snowshoeing, the temperature was around – 4 degree F and I was quite comfortable, by the way I was also using the hoodie 1.0, the regular mittens and the HotSox in an old pair of Canadian armed forces mukluk, so I’m glad I bought those Items too.

    From Canada

  2. Chris (verified owner)

    I took my family skiing in CO and three of four of us wore the BasePro Pant and the Top. I wore the crew neck BasePro Top which eliminated the need for another layer of either a turtleneck or a different clothing article to keep my neck warm and dry. I wore a Marmot Androo Jacket, a minimal insulated shell, over my BasePro to keep the wind out. One daughter wore a Hybrid Hoodie 1.0 with it and the temp regulated with the Base Pro; another daughter wore a goosedown jacket but was hot. Once she shed the goosedown for a soft shell, she was fine. Our activity temps ranged from -4 to 8 degrees F at night and 4 to 23 degrees F in the day. Those of us that wore the Fortress we were warm and comfortable always even as the temps increased. The only time we were overly warm was inside the condo in the morning as we were preparing for the day. The one that did not wear the Fortress Clothing wished she had it. The early remark was that it made her look fat. The others said “who cares – we just needed one layer and a shell and didn’t have to shed or add as the weather changed. Easy to get ready in the morning.”

    I’d love to see a later version of the Base Pro be thinner. I would also like to see the sleeves on the Top come down just a bit further.

  3. Michael (verified owner)

    I’m a production manager in a meat processing plant. I bought the base pro 1/4 zip top for me to try at work. I was amazed at how well it worked and told my pack room supervisor about the shirt. She had me order it for her and was highly impressed and asked me to order the base pro pants for her. I ordered them for her and again she was highly impressed and told one of her friends there who also wanted the pants. She is completely satisfied with them and as word of mouth gets around the company I’m sure there will be more orders placed.

  4. Chris L Bolkan (verified owner)

    This stuff is AMAZING! I was introduced to it watching Shark Tank and I knew immediately I had to have some. I am an avid barefoot water skier, white water kayaker, and snow skier in the Pacific Northwest. The shoulder seasons can be cold here, and winter is well…winter. I first thought these under layers would be PERFECT under my drysuit when I kayak, so I bought a base pro crew and bottoms. I could not believe the difference in comfort. The biggest improvement was that no other combination of long underwear, fleece and neoprene under the drysuit could keep me comfortable for as long. If I put too much of my normal solutions on I would start out overheated, then sweat then chill. When I wear the Fortress gear I start out warm but not too warm and stay comfortable for hours longer than any other combination of insulating layers. If it is really cold, I just throw a medium weight underwear top over it for an additional layer over my forearms. I may end up just getting a pair of those cycling arm insulators instead of bothering with the additional long underwear layer to better insulate my forearms. That said they did the right thing not insulating the forearms. When I use this gear under my barefoot drysuit, there is no need for forearms to be insulated. and the gear is perfect as-is. I am warm and comfortable in the boat between runs while my partner gets chilled wearing a fleece one-piece suit under his drysuit. Again the amazing thing is how much LONGER I can remain comfortable compared to any other under-layer combinations under the drysuits. I recently bought a second set (the 1/4 zip T) to use for snow skiing. I haven’t had the chance to use it yet, but from my experience with this gear under both breathable and non-breathable drysuits, it is going to be the best insulating layers I have ever worn under my shells. I will be shredding the freshies long after everyone is frozen out. Guaranteed. I am not saying this is everyman’s underwear, but if you are frequently in the cold, where you are both active and sweating and alternately not so active over long periods of time, NOTHING will keep you more comfortable or for as long. Nothing. This gear sells itself. All I can say is if you are introduced to it, and you do the kinds of activities where it will benefit, you will just know. I am just writing this so if you have any doubts about the technology or effectiveness…..don’t. It’s the bomb!

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