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Wore this under a shell on a windy hike and my core stayed warm the whole time without overheating on the climbs. The Polartec Alpha insulation really does breathe, and it's thin enough to layer without feeling bulky.

Took this out for a frosty trail run and the Polartec Alpha insulation kept my core perfectly warm without any clamminess, even when I picked up the pace. Breathability is genuinely impressive for a gilet this cozy.

I’ve worn this gilet on chilly morning runs and it keeps my core toasty without me overheating by the time I stop. The Polartec Alpha insulation really does breathe well—no sweaty clamminess, just steady warmth where I need it.