BasePro 1/4
The BasePro 1/4 Zip brings precision temperature control to your cold-weather layering system. Engineered with AERIS™ 250 insulated, 4-way stretch fabric, this piece regulates core warmth while allowing full freedom of movement. The 1/4 zip adds easy venting for high-output activities or changing conditions. Moisture-wicking and antimicrobial, it keeps you dry, warm, and fresh even in tough environments.
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Replaces 2–4 traditional layers – Ditch the bulk
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Adaptive ventilation – Zip down for cooling, up for warmth
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Versatile single layer – Wear solo or under your favorite shell
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BasePro 1/4 Zip (TRUE TO SIZE)
Male: Order your normal size for a regular fit
Example: 6'2", 225lbs, wearing XL.
Female: Order one size smaller than your usual size for the best fit.
Example: 5'7", 130lbs, wearing Small.
Built for the Cold. Designed for More.
Fortress Clothing delivers innovative cold-weather gear powered by USA-made AERIS™ insulation. Designed for work, outdoor adventures, and everyday winter conditions, our products focus on lightweight warmth, comfort, and performance when the temperature drops.
Why Choose Fortress?
- Advanced Insulation Technology – Innovative AERIS™ insulation designed for cold-weather performance.
- Warmth Without the Bulk – Lightweight designs that help keep you warm without unnecessary layers.
- Performance in Wet Conditions – AERIS™ insulation is designed to retain warmth even when wet.
- Comfort and Versatility – Gear designed for work, outdoor activities, and everyday wear.
- Featured on Shark Tank – Discover the insulation technology behind Fortress Clothing.
FORTRESS CLOTHING — WARM TO THE CORE™
Gear up for the cold and experience a different approach to winter warmth.
WARMTH THAT WORKS WHEN WET
Designed to retain warmth even in wet conditions from rain or sweat.
LIGHTWEIGHT. SERIOUS WARMTH.
Get dependable insulation without the unnecessary bulk.
BREATHABLE COMFORT
Helps manage heat during activity so you can stay comfortable on the move.
Buy it with
Key Features
built with USA-made, patented insulation tested for over 16 years in real-world environments. It delivers consistent warmth even when wet, lightweight performance without bulk, and breathable comfort during activity.
Made to perform when it matters most, we offer quality that you can count on. Tested and proven to deliver consistent results, it's made for everyday use and beyond.
Wind & water resistant shells – protection from harsh elements4-way stretch fabrics – full mobility for work or outdoors
IN the wild
