Active insulation
No more changing layers when you sweat. AERIS™ insulation keeps working when wet, helping you stay warm and comfortable without worrying about sweat or moisture while you're out in the winter.
ADAPTIVE WARMING INSULATION
Warm Like down Works like Wool
Fortress uses patented USA AERIS™ insulation to deliver real warmth without the weight, so you can go further, work harder and stay warmer — in any condition.
REAL PEOPLE. REAL CONDITIONS.
WARM WHEN WET
LIGHTWEIGHT
USA-MADE AERIS™
BUILT FOR COLD
AERIS TECHNOLOGY
Warmth engineered for the extreme.
AERIS technology helps regulate body heat with intelligent insulation designed for demanding conditions.
THE SCIENCE
HOW AERIS WORKS
Lightweight warmth
High-performance protection without unnecessary bulk.
BASEPRO SERIES
YOUR ENTIRE LAYERING SYSTEM.
WICK AWAY MOISTURE. STAY WARM WHEN WET. DRY FAST. BasePro wicks away sweat, stays warm when wet, and dries quickly—keeping you warm and comfortable without the cold, clammy feeling. One layer replaces 2–4 traditional layers.
SHOP BASEPRO SERIES
One system. Ready for whatever the forecast brings Wet Or Dry
Less bulk. More capability.
Base layer
Mid layer
Insulation
Shell
One BasePro system
QUICK PRODUCT FINDER
HELP ME FIND THE RIGHT PRODUCT.
Answer a few simple questions and we’ll help you find the best Fortress product for your needs, conditions and activities.
NEW LAYER SYSTEM
Replace random layers with one streamlined system built to work together.
- Less bulk, more mobility
- Better temperature control
- Designed to work together
- Ideal for changing conditions
ALL-IN-ONE JACKET
One jacket. All the warmth, all the performance.
- Warm when wet
- Lightweight and packable
- Durable and weather resistant
- Perfect for everyday and extreme conditions
STILL NOT SURE?
TALK TO OUR EXPERTS
Get practical guidance from the Fortress team and find the right system for your conditions.
REAL CUSTOMERS. REAL RESULTS.
Trusted performance for demanding conditions.
★★★★★
“Warm, dry, and ready for the mountains.”
Alex R.Explore the system
★★★★★
“Dependable protection when the weather turns.”
Jordan M.Shop cold-weather layers
★★★★★
“Technical gear for brutal conditions.”
Taylor S.Find your outer layer
BUILT FOR REAL CONDITIONS
Technical layers and dependable gear for the days that demand more.
FIELD TESTED
WORK
Built to keep moving when conditions turn hard.
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BUILT TO ENDURE
HUNT
Protection and performance for long days outside.
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GO FURTHER
ADVENTURE
Reliable comfort for every route and forecast.
Explore adventure gear
READY EVERY DAY
EVERYDAY
Technical warmth that works wherever the day leads.
Explore everyday gear
FREE SHIPPING
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EASY RETURNS
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30-DAY GUARANTEE
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CUSTOMER SUPPORT
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