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Fortress Ultra-Cold Weather Classic Jacket Liner - Aeris 500

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  • Product Description
  • About Fortress

The Classic Jacket uses patented AERIS 500 (" / 13mm of loft), a revolutionary patented insulation Technology that keeps you warm, even if it gets wet!

The Classic - has changed the way workers and survivalists approach the cold.

As a mid-layer garment, the Classic Jacket is built using a Polyester Mesh lining that helps pull moisture and sweat away from the body. The outer fabric is a wind resistant Polyester Micro Rip-Stop Taffeta with a DWR (Durable Water Repellent) finish, keeping you warm and comfortable from -35F to 50F without the need for adding or removing additional insulation layers, even during the coldest conditions.

The Classic Jacket is designed to be a mid-Layer worn over a synthetic thin layer under-garment, with a light uninsulated outer shell jacket or coverall that goes over the top.

We suggest that you do not wear 100% natural fiber underneath the jacket if going to be highly active, as natural fibers will absorb and retain moisture, which degrades the performance of the AERIS Insulation.


  • Patented AERIS 500 Insulation Technology (" / 13mm of loft) Maintains Warmth, Even When Wet
  • Exceptional warmth-to-weight ratio
  • Full Dual Head YKK Center Front Zipper
  • 2 Insulated Hand Pockets
  • Adjustable Draw Cord at Waist
  • Lower Side Slits for Ease of Movement
  • Wind Resistant


  • 100% Polyester Mesh Lining
  • 100% Polyester Micro Rip-Stop Taffeta with DWR Finish

*Made in the USA

What is Fortress Clothing?

Fortress Clothing, quite simply, actually keeps you warm in cold weather, even if you are wet. Dozens of others claim to "keep you warm in cold weather," but Fortress is different. We actually do it. We eliminate the need for bulky layers, which lead to excessive sweating followed by then being cold AND wet. Our patented technology keeps your body the perfect temperature WITHOUT layers. No sweat.

Who are our customers?

We passionately strive to serve and solve problems for those who work, play and enjoy activities that expose them to the elements found in the outdoors, by delivering innovation, quality and value in our goods and services. Our customers are as varied as the fish in the sea. We serve the paragliding community, allowing you to enjoy the sport you love without the constraints of layers and the discomfort of wind chill.

We outfit hunters and fly-fisherman. We keep the guys working the oil fields in North Dakota warm. Our cold weather clothing allows the skiers, snowboarders, snowshoers, and other winter sports enthusiasts warm without cumbersome bulk.

Our customers range from survivalists and preppers to the average Joe just trying to stay warm while shoveling his walk. Our customers are people just like YOU.

What do we believe?

We believe there is no such thing as bad weather only bad clothing or gear. We believe in going where there is no path and leaving a trail by thinking something nobody else thinks, building something nobody else builds or improving something that already exists.

What makes Fortress Clothing different?

We build products that are designed with purpose and end use in mind, utilizing the needs of our customers and the attributes of protection, mobility, strength and durability.

We don't just say "we keep you warm;" we actually do it.

Customer Reviews
Fortress Ultra-Cold Weather Classic Jacket Liner - Aeris 500