ThruDark Siege Full Zip Tech Fleece

Built for cold-weather performance, the Siege Tech Fleece is a lightweight technical mid-layer made for hiking, mountaineering, skiing and trail running. Constructed from Polartec® Power Grid™, it delivers warmth, breathability and moisture management without adding bulk, keeping you comfortable during high-output activity in colder conditions.

The advanced grid construction traps warmth while allowing heat and moisture to escape, helping regulate body temperature as your pace changes. Fast-drying and highly breathable, it works hard during demanding climbs, long hikes and fast-moving days in the mountains.

The full-zip design gives you easy temperature control and makes layering straightforward. Elasticated cuffs help lock in warmth and create a secure fit under outer layers, while YKK® zipped pockets keep essentials close at hand.

Lightweight, packable and built for movement, the Siege Tech Fleece is an adaptable layer ready for changing conditions.