Pro 保暖背心

Wore this on a windy 40-degree hike and my core stayed warm the whole time without overheating on the climbs. The breathable insulation is the real win here — I barely noticed I had it on until I stopped. Runs a touch snug, so size up if you layer a fleece underneath.

I’ve worn it for three straight bike commutes in near-zero wind and my core stayed warm without that sweaty, clammy feeling you get from most insulated layers—the Polartec really does breathe. It’s light enough to pack into nothing but cuts the chill like a much heavier jacket.

Took this out on a freezing morning run and the Polartec Alpha insulation did exactly what it promised—warm core without that sweaty, clammy feeling I usually get layering up. It’s light enough to forget you’re wearing it, which is the whole point for me.