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Quantity
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BasePro Crew — The Only Base Layer You Need
Stay warm, dry, and comfortable all day. The BasePro Crew replaces 2–4 bulky base and mid layers, giving you serious warmth in a simple, lightweight design. Why It Works
AERIS™ 250 Insulation – ...
Reviews
4.6
51 ratings
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Great base layer, im 6'2-200lbs and the xl fits perfect! Its extremely comfortable and warm! I am 💯% satisfied with all of my purchases from them and now my wife wants it all! Definitely the best winter wear out there! Keep up the good work Fortress and thankyou!
Charles · February 2, 2026
Fits weird. Not flexible
Scott · January 8, 2025
Soft!
These Fortress base layers are amazingly soft and comfortable! They are far superior in comfort in our opinion to the military ecwcs layering system. Plus with Fortress you have less layers vs ecwcs. Also with Fortress you can get soaked wet and still get warm. However with ecwcs primaloft soaked wet...uh oh your in trouble. (same with goose down) We have not tested these yet in the cold, but we remember when we first tried on the ecwcs system before we tested it in the cold. (and the ecwcs works well in the cold) The fortress feels way better in temperature regulation thus far pre cold test vs the ecwcs pre cold test. I have every confidence Fortress will blow away ecwcs in the cold with less layers and more comfort. That’s why we bought the whole family not only one set each of these base pros, but 2 sets! Did I say they are comfortable oh my!