Smart Insulation Technology

SMART INSULATION

The Science of Warmth

POWERED BY AERIS INSIDE TECHNOLOGY
Cloud - Fortress Clothing
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Cloud - Cobalt

The Cloud Jacket is your perfect balance of lightweight comfort and serious warmth. Built with ultra-soft materials and Patented insulation, it wraps you in cloud-like coziness without the bulk. Ideal for everyday wear, chilly adventures, or lounging in warmth. Temp Rating: 15˚F to 70˚F –...
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Cloud - Fortress Clothing
Cloud
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Terra Hoodie - Fortress Clothing
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Terra Hoodie

Built for work, adventure, and everyday wear, the Terra Hoodie delivers core warmth without the bulk. Insulated Core – Patented AERIS™ keeps your torso warm Lightweight Sleeves & Hood – Breathable and flexible 4-Way Stretch – Moves with you Wind & Water-Resistant – Light...
$139.99
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Terra Hoodie - Fortress Clothing
Terra Hoodie
$139.99
$139.99
SockPro 2.0
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SockPro 2.0

The World's First Insulated Knit Sock, featuring patented Aeris 250 ½" insulation. Updated Features: ✅ Knit Ankle Cuff – Easy on & off convenience✅ Brushed Liner – Enhanced comfort around the foot✅ Improved Design – Maximum fit & support✅ AERIS 250 Insulation – Keeps...
$34.99
$34.99
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SockPro 2.0
SockPro 2.0
$34.99
$34.99
Cloud - Fortress Clothing
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Cloud - Cobalt

The Cloud Jacket is your perfect balance of lightweight comfort and serious warmth. Built with ultra-soft materials and Patented insulation, it wraps you in cloud-like coziness without the bulk. Ideal for everyday wear, chilly adventures, or lounging in warmth. Temp Rating: 15˚F to 70˚F –...
$149.99
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Cloud - Fortress Clothing
Cloud
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Latest News

Using our patented AERIS™ USA-Made Insulation, keepinh you warm even when wet, eliminating the need for bulky layers. Whether you’re working long shifts outside, hunting in the backcountry, hitting the slopes, or just walking the dog in freezing temps—Fortress adapts to your body and your environment. It’s lighter, warmer, and more durable than traditional gear, and built to last season after season. Simply put: one Fortress layer replaces three to four traditional ones.

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The Best Do-It-All Casual Jacket: The New Cloud Jacket

The Best Do-It-All Casual Jacket: The New Cloud Jacket

Finding the perfect jacket for unpredictable weather is tough—until now. Introducing the Cloud Jacket by Fortress Clothing—a lightweight yet incredibly warm do-it-all jacket designed for temperatures from 10˚F to 65˚F. Whether you're out...
Stay Warm at Home: The Best Clothing for Cold Indoor Temperatures

Stay Warm at Home: The Best Clothing for Cold Indoor Temperatures

As temperatures drop, many people—especially older adults—struggle to stay warm inside their homes. Whether you live in a drafty house, keep the thermostat low to save on heating costs, or simply feel the...

The Insulation Changing Winter Gear Forever

TESTING INSULATION

Adaptive Insulation

1-2 Layer System

The Insulation Changing Winter Gear Forever

TESTING INSULATION

Adaptive Insulation

1-2 Layer System

The Insulation Changing Winter Gear Forever

TESTING INSULATION

Adaptive Insulation

1-2 Layer System

The Insulation Changing Winter Gear Forever

TESTING INSULATION

Adaptive Insulation

1-2 Layer System