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BasePro Tee


1. Stand alone piece (Not Wind-Proof)
2. Wear long sleeve under it if you want sleeves.
3. Wear with outer shell uninsulated 15°F to 70°F
4. Wear with Insulated fortress Jacket's, Coat's, for more warmth 10˚F & below
Model in photos: 
6'1" 205lb  = Large


-88% Polyester / 12% Brushed Spandex 4 way Stretch


  •  Maintains Warmth, Even When Wet  (AERIS 250 Insulation Technology (¼" / 6mm of loft)
    – Reinforced Stitching
    – Unrestrictive Full Range of Motion
    – Lightweight, almost feels like nothing on at all
    – First Layer for All Activities
    – Reflective Fortress Logo at Front Left Chest and Center Back neck


Weight 16 oz
Dimensions 12 × 12 × 3 in

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Customer Reviews

Based on 5 reviews
North Country Must Have!

I live in MN and love to get out running in the winter. At 13 degrees and 66% humidity I took the Base Pro for a test run tonight - and it was a huge success! Wore it over a basic inexpensive long sleeve shirt and thats it. No more layers! Gearing up for winter running is hard to measure - you either get too cold or too hot - but the Base Pro hit the spot! Not too tight and not too loose for me at 5’7” 160.

Will be getting the long sleeve 1/4 zip for those really cold days!

Greg Warburton
BasePro TEE

If you wear this BasePro TEE beware, you will not be getting cold at all, I haven't tried them below -0 yet, but anything above that temp you are covered!!!!

John Byrne
Another winner from Fortess Clothing

The BasePro Tee is light, very comfortable and very warm. I’m pleased that I bought it.

Mark Dirnberger
Great Baselayer

I just received my short sleeve base layer. Fits great, size large I am 5'10" and 175.
I have been wearing fortress clothing for several years, never fails to keep me warm and dry in very cold weather. Doesn't overheat when the temps warm up.

This Insulated TEE works and simplified layering!

I’ve loved this insulated tee, I hunt and participate in winter sports and this basepro TEE keeps me warm , and works even after I get wet or sweaty which has always been a huge downside of winter sports for me. Cold chills have always been the worst part of winter. so this is a game changer for me.

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