Men's Siege Fleeces | Polartec® Power Grid™ Mid Layers

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Men's Siege Technical Fleeces

Lightweight men's mid-layers and fleece jackets built for hiking, mountaineering, skiing, and trail running in colder climates and winter weather. Made with innovative Polartec® Power Grid™ fabric, the Siege tech fleece keeps you insulated without overheating during outdoor adventures.

When your activities push your limits in tough cold conditions, ordinary fleece just doesn’t cut it. Siege tech fleece uses advanced fabric technology to keep you warm and comfortable while adapting to your activity level.

This collection is all about lightweight mid-layers that provide the perfect balance of warmth and breathability — no heavy insulation, just smart design to keep you cozy without the bulk.

Thanks to Polartec® Power Grid™ fabric, every piece offers superior thermal management, so you stay comfortable no matter how intense your hike, climb, ski, or trail run gets.

Check out the Siege Tech Fleece Full Zip. Its full zip design lets you control ventilation easily as your body heats up or cools down during varying activity levels.

This jacket is perfect for mountaineering and other dynamic outdoor sports where conditions and exertion change fast. It keeps you comfortable whether you’re climbing hard or taking a breather.

Ideal for multiple disciplines, the full zip combines insulation and breathability, keeping you warm without overheating in winter’s toughest conditions.

If you prefer something more streamlined, the Siege Tech Fleece Half Zip offers targeted ventilation with a half zip that’s great for trail running and skiing — activities where you want less bulk and precise temperature control.

The half zip keeps the same great insulation and breathability, all while letting you move freely without fussing with a full zipper.

For those who need extra coverage, the Siege Tech Fleece Hooded adds head protection with a hood that works seamlessly with the jacket’s thermal management technology.

This hooded fleece is made for serious winter mountaineering and hiking, keeping your core and head warm while still allowing breathability during high-output activity.

The advanced fabric helps prevent moisture buildup and keeps you insulated without overheating, no matter how tough the conditions get.

The whole Siege tech fleece collection is designed to work together as a comprehensive thermal system — perfect for layering or wearing on its own — adapting to whatever your outdoor day throws at you.

These men’s fleece jackets aren’t just for one activity; they’re versatile enough for hiking, mountaineering, skiing, and trail running, giving you reliable warmth and comfort across the board.

From the full zip’s all-around control to the half zip’s sleek efficiency, and the hooded fleece’s extra protection, each piece features cutting-edge fabric technology that delivers smart insulation without the heat trap.

Whether you’re building a winter layering system or picking the perfect jacket for your next adventure, the Siege tech fleece collection has you covered with lightweight, breathable, and performance-driven gear.

Discover how Polartec® Power Grid™ fabric is changing the game for men’s insulated clothing, keeping you warm and dry without overheating — ideal for demanding winter activities in cold climates.

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SIEGE TECH FLEECE FULL ZIP

Men's grey lightweight zipped mid layer fleece

SIEGE TECH FLEECE FULL ZIP

SIEGE TECH FLEECE FULL ZIP

Men's green lightweight zipped mid layer fleece

SIEGE TECH FLEECE FULL ZIP

SIEGE TECH FLEECE FULL ZIP

Men's black lightweight zipped mid layer fleece

SIEGE TECH FLEECE FULL ZIP

SIEGE TECH FLEECE HALF ZIP

Men's grey lightweight half zip mid layer fleece

SIEGE TECH FLEECE HALF ZIP

SIEGE TECH FLEECE HALF ZIP

Men's black lightweight half zip mid layer fleece

SIEGE TECH FLEECE HALF ZIP

SIEGE TECH FLEECE HALF ZIP

Men's green lightweight half zip mid layer fleece

SIEGE TECH FLEECE HALF ZIP

SIEGE TECH FLEECE HOODED

Men's green lightweight hooded mid layer fleece

SIEGE TECH FLEECE HOODED

SIEGE TECH FLEECE HOODED

Men's grey lightweight hooded mid layer fleece

SIEGE TECH FLEECE HOODED

SIEGE TECH FLEECE HOODED

Men's black lightweight hooded mid layer fleece

SIEGE TECH FLEECE HOODED

FAQ'S

What activities are Siege men's tech fleece designed for?

What makes Siege fleece different from standard men's fleece jackets?

How does Polartec® Power Grid™ fabric enhance performance in cold conditions?

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