Smart Insulation Technology

SMART INSULATION

The Science of Warmth

POWERED BY AERIS INSIDE TECHNOLOGY
Shadow 2.0 - Fortress Clothing
Shadow 2.0
Stay warm and protected on every winter adventure with the Shadow 2.0. Built with 100% polyester lining and 250 AERIS® insulation, this jacket provides superior warmth and flexibility. The 4-way stretch fabric ensures maximum freedom of movement, while the wind & water-resistant DWR material...
$199.00
$199.00
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Shadow 2.0 - Fortress Clothing
Shadow 2.0
$199.00
$199.00
Hybrid Hoodie - Fortress Clothing
Hybrid Hoodie - Black
Hybrid HoodieDesigned to be your go-to all-season outer layer—lightweight, breathable, and warm even when wet. Built with patented USA-made AERIS™ insulation (500 in the core, 250 in the arms and hood), it delivers targeted warmth and mobility without bulk. Wear it alone for everyday...
$159.00
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$159.00
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Hybrid Hoodie - Fortress Clothing
Hybrid Hoodie
$159.00
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$159.00
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Cloud - Fortress Clothing
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
$149.99
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Cloud - Fortress Clothing
Cloud
$149.99
$149.99
Terra Hoodie - Fortress Clothing
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
$139.99
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Tundra Coat 2.0 - Fortress Clothing
Tundra
Engineered with top-tier materials, this jacket delivers unmatched durability and performance in extreme weather. Featuring windproof, water-resistant fabrics with a DWR (Durable Water Repellent) finish, it keeps you warm and dry no matter the elements. Key Features: Body: 500 AERIS™ Insulation for maximum core...
$269.00
$269.00
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Terra Hoodie - Fortress Clothing
Terra Hoodie
$139.99
$139.99
Tundra Coat 2.0 - Fortress Clothing
Tundra
$269.00
$269.00

NEW ARRIVALS

Check out the new items for 2025!
New Arrivals

Accessories

New landed gloves and facemasks
Accessories

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

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